- Support LCF (Last Column Flag) mode per DEC STD-070
  (Despite years of protest that it's stupid)
- "Properly" support CSI 7 m and CSI 27 m
  Now, when in "Negative Image" mode, changes to the foreground
  change how the background is drawn and vice-versa.  Perviously
  this command just swapped the two values and called it good.

At the same time, add BD, BE, PE, and PS to the terminfo entry.

Note that it seems this is "normally" detected by seeing if $TERM
contains "xterm" which shouldn't work with SyncTERM (which is wildly
incompatible), but the terminfo source file here:
https://invisible-island.net/ncurses/terminfo.ti.html
Gives us hope in the form of this comment:

https://invisible-island.net/xterm/xterm-paste64.html

Bracketed paste was introduced by xterm patch #203 in May 2005, as part of a
larger feature for manipulating the clipboard selection.  Few terminals aside
from xterm fully implement the clipboard feature, but several copy this
detail.  The names for the extended capabilities here were introduced by vim
in January 2017, but used internally.  In 2023, vim patch 9.0.1117 is needed
to work with this change.

That is to say that it likely won't work on anyone's system today
(except maybe Cyan's), but it may magically start working in the
future... assuming tic supports these capnames.  No real clue there
since there's absolutely no termcap support, and I use FreeBSD.

Update the script to verify pixel operations are supported.

You can copy whole, or portions of a PPM file from the cache directory
to the screen, optionally applying a mask.  The mask can be specified
as a base64-encoded bitmap or as a PBM file in the cache directory.

You can also copy portions of the screen into an internal buffer, and
draw from that internal buffer.  There's plans to support loading an
image file from the cache directory into the buffer as well.

Portions of the buffer can be copied to the screen, optionally
applying a mask as with drawing PPMs.

There's also plans to support copying a PBM file into a mask buffer.

I've added the syncterm-bounce.js script which simply bounces the
SyncTERM icon around the screen like the classic screensaver we all
hate.  I initially wanted to replace the spinning cursor with it,
but there doesn't seem to be a way to replace that with a script. :(

To use the script, just add the text:
@EXEC:syncterm-bounce.js@ to the end of your logon.js script.

Log in to nix.synchro.net with the latest nightly build or build from
git to see the script in action.

Not actually part of CTerm, but documented here anyway.

Now, the window() is set to the curr coordinates.
Use generic functions for implicit and relative movement.
Make the scrolling region behave much more like the DEC source.

is deeply impacted by the vt glitch, and I'm not dealing with that.

Add CSI I support.
Fix CSI SP d support.

be expanded if people like it... this can be used to store and replay data,
making sprites a lot easier to implement client-side.

Allow setting a '0' for left/right margins to leave them unchanged.

Don't support CSI ! p anymore since RIS (ESC c) works correctly now.

bottom margin, you can now create a completely separate sub-window.

This command replaces CSI s to save the cursor position... since this
non-standard extension is very widely used, set left/right margin only
works when mode 69 is enabled using CSI ? 69 h.  The margins are retained
when CSI ? 69 l is sent, only the command to adjust them is disabled.

Fix "CSI ["

CSI Pn Y - Cursor Line Tabulation
CSI Pn SP c - Tab Stop Remove
CSI Pn k - Line Position Backward

CSI Pn b (Repeat previous char)
	Actually mildly useful... repeat any character.
CSI Ps d (Line position absolute)
	Moves to a specific row without changing column.
	Mildly useful.
CSI Pn a (Cursor forward)
	Identical to CSI Pn C
CSI Pn ` (Absolute position in line)
	Identical to CSI Pn G
ESC H (Add Tab Stop)
	ie: Break everything else that uses tabs this session.
CSI Pn g (Clear Tabs)
	ie: Break everything else that uses tabs this session.
CSI 2 $ w (Request Tab Report)
	So, maybe it can be fixed after you break it!  Yay!
ESC M (Reverse Line Feed)
	Basically up one line.  Not really useful since we have cursor up.
CSI Ps e (Line position relative)
	Identical to CSI Pn B

don't move the cursor position.

The biggest impact is in the cterm =1n query, which is retaining 0 for
success and now uses 1 for all failures.

It supports:
CSI 38 : 2 : Z : R : G : B m
CSI 38 : 2 : R : G : B m
CSI 38 ; 2 : Z : R : G : B m
CSI 38 ; 2 : R : G : B m
CSI 38 ; 2 ; R ; G ; B m

Where Z is an ignored colorspace identifier.  For compatability, I'll likely
add support for the colon-separated variants "soon", but for now just support
the semi-colon one.