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Also, include math.h

Simplest way is to use the alt-left/right snapping.

This fixes all the window adjustment "stuff", but the new aspect
ratio enforcement means that ALT-UP and ALT-DOWN are useless for
resizing the window unless it's not already snapped... use ALT-LEFT
and ALT-RIGHT to decrease/increase the window size.

Also, the 8x16 font at 80x25 is *not* a square pixel aspect ratio.
As a result, it now stays "proper", which is likely not what you
want.

This was discovered when I was trying to make DigitalMan happy
because he wanted the apsect ratio retained on scaling.

Sorry for the impending imminent scaling hassle DigitalMan!

This is pretty insane since SDL2 completely ignores the keysym value
of the X11 keyboard event, so here's what we do...

1) When there's a keypress that includes right-alt, store the sym/mod
2) When we get text input, if it's the same as we would get if ALT
   wasn't pressed for the last keydown, parse through the mapping
   (ie: handle ALT keys)
3) If it's different, use that (gets AltGr modified value)

I get that AltGr is hard in a cross-platform way, but just pretending
it doesn't exist at all for key input is a very weird choice.

With maximized windows, unexpected behaviour occured when the program
resized itself, then the window manager minimized/restored the window
Should address SF bugs #18 and #13

Make an exception for all keypad stuff.

There are a number of conio changes in here too... too many to list.  Check
the diffs if you actually want to know what changed.

May fix https://sf.net/p/syncterm/tickets/19/

Please try to log in to SourceForge when creating issues or I won't be able
to contact you with follow-up questions or get confirmation when an issue
is resolved.

a new texture with the same address as a destroyed texture causes crashes.
Just allocate the new texture before freeing the old one to prevent that
from occuring.

These allow setting the initial window size for modes that don't force
integer scaling (ie: SDL).

While we're here, clear a renderer before free()ing the texture to prevent
crashing on some nVidia cards.

Addresses https://sf.net/p/syncterm/feature-requests/17/

There's still some shittiness with the keypad, but nobody really knows how
that works anyway.

number to the remote.
Fixes bug https://sourceforge.net/p/syncterm/tickets/15/

Add support for scroll "buttons" (buttons 4 and 5).

This fixes some input weirdness with C64 mode (and likely others)

semaphores sometomes have odd behaviour... just use the same mutexes and
semaphores as everywhere else.

The SDL wiki lists KMOD_MODE as AltGR... if that flag is flying in a
keypress, do not block text input.

change the window size and it should work out alright.

anything that doesn't print is "fine".

getcliptext() and copytext() (ie: copy/paste) now work on UTF-8 strings.
Not tested on Win32 yet.

This is planned to work with the built-in fonts... no real idea how to
make this work with dynamic fonts at this time.

We'll also need a line drawing set thing ala curses, but I'll worry about
that when/if I update uifc32 for unicode.

*may* break all sorts of other things.