Not a huge deal, but there it is (or was).

Instead, have the r2yptr and y2rptr pointers that need to be set
to those tables in order for interpolation to work.  Not setting one
locks ciolib into "LCD" modes (everything uses square pixels), and
XBR scaling is disabled.

The CIOLIB_INTERPOLATE_OBJS make variable contains the path to the
object file that contains those tables, so it's just a matter of
some code and an extra (128MB) object to link against.

Fixes high CPU utilization at menus.

This increases the binary size by 128MB, but allows much faster
startup, and should actually use less memory since the VM can page
out (or just not page in) the parts of the table it doesn't use,
and it can share the pages between different instances.

Use a static char string list for the main menu options. These can't be const
becaue uifc.list() *can* modify them (!) - if they're too long.

Free the global opt[] (option list) when exiting.

These really are not of themselves important, but reduce the noise reported by
valgrind when looking for real issues.

(seeing a pattern here) :-)

Use weight == 0 instead of int == double when deciding to copy pixel
When interpolating width, do it by column, not row

I expect BitBlt(..., BLACKNESS) to be the better optimized of the
two, and there's no reason to actually reat the source bitmap.

Cleans up artifacts in interpolated values nicely.

I don't think it would've even been possible to match these expressions without
the tilde.

After a negative-match of a Guru expression, we were searching for the next
'(' anywhere in the subsequent chars of the file rather than just the next
line that started with an open-parenthesis character.

This bug was the secondary cause of the buffer-overflow crash addresseed in
commit 86150e0a which was triggered by my recent updates to the guru.dat.

Create a proper aspect fix function
Centre bitmap in window with correct aspect ratio
Fix cursor at resize points
Explicitly set high DPI awareness
Don't snap window larger than allowed

Since this is the newest/simplest display driver, I'm going to use
this to decide how to do scaling in general so I can abstract that
into shared code to ensure all drivers have the same scaling
behaviour.

I haven't tested mouse on windows with black bars yet though, so I
assume that's broken...

The 'list' member was allocated by iniParseSections() but never freed.

Caught be Nelgin's recent valgrind report, e.g.:

==2725235== 56 bytes in 1 blocks are indirectly lost in loss record 82 of 191
==2725235==    at 0x484DCD3: realloc (in /usr/libexec/valgrind/vgpreload_memcheck-amd64-linux.so)
==2725235==    by 0x4FA351C: strListAnnex (in /home/bbs/sbbs/repo/src/sbbs3/gcc.linux.x64.lib.release/libsbbs.so)
==2725235==    by 0x4F9ADDE: iniParseSections (in /home/bbs/sbbs/repo/src/sbbs3/gcc.linux.x64.lib.release/libsbbs.so)
==2725235==    by 0x49F1F0A: read_chat_cfg (in /home/bbs/sbbs/repo/src/sbbs3/gcc.linux.x64.lib.release/libsbbs.so)
==2725235==    by 0x49E8BF1: load_cfg (in /home/bbs/sbbs/repo/src/sbbs3/gcc.linux.x64.lib.release/libsbbs.so)
==2725235==    by 0x5C14C75: ftp_server (in /home/bbs/sbbs/repo/src/sbbs3/gcc.linux.x64.lib.release/libftpsrvr.so)
==2725235==    by 0x5D5AB42: start_thread (pthread_create.c:442)
==2725235==    by 0x5DEBBB3: clone (clone.S:100)

Will be needed once scaling works properly.

Load icon from resource file
implement seticon()

While the features are all there, some are buggy.  Scaling is wrong
for example, and keyboard input may do weird things if shift or
control are held when you take focus away from the window, then
release them when the focus is elsewhere, then re-focus the window.
This should only impact extended keys (ie: ones that don't send a
character to the remote).

Instead, only delete it if the size has changed since the last
frame.  This should make things snappier.

While we're here, eliminate some explicit int64_t usage.

(not sure why uifc_winmode_t is signed since it's a bitfield, but
that's above my pay grade).

This caused double-keys on those when numlock was off.  Only the
number keys and period need special NumLock handling.

Fixes bug 108 on SourceForge, thanks nelgin!

Add setwinsize and setwinpos
Move blit from rect into gdi_thread
Add beep support
Add (non-functional) settitle support
Support ciolib scaling in addition to GDI scaling
Add window-size snapping
Support -iG in SyncTERM

GDI is still the second-least preferred mode, so auto mode will only
use it if the windows console somehow fails.  But at least people
can play with it.

The trigger was this line in the recent change to guru.dat:
Unrealized potential. :-(

That open paren was parsed as the beginning of a new guru expression. A very
long guru expression that overflowed the stack variable 'str' here.

Add setwinsize and setwinpos
Move blit from rect into gdi_thread
Add beep support
Add (non-functional) settitle support

When running Windows 11 in a VirtualBox VM, Sleep(1) appears to take
much more than 1ms to return.  This causes large delays drawing menus
using WIN_DYN (as SyncTERM does).

If WIN_DYN is set, just use kbhit() with no delay.  Leave the delay
there for !WIN_DYN though.

This should generally speed up SyncTERM menu navigation as there
was a 50ms delay for each menu on the screen.

unresolved external symbol _try_gdi_init referenced in function initciolib

Function is dependent on WITH_GDI, not _WIN32

There was a lot of weird things going on to avoid locking vstatlock
inside of screenlock.  Simply this by copying needed vstat stuff
while we hold the lock.

Also, get SyncTERM to stop displaying (null) as the mode.

Video is very slow in the menus, and the input appears to repeat
forever when connected (but *not* in the menus), but it's something
at least.