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.

1) XTerm using semicolons.  CSI 38/48 ; 2 ; 0 ; R ; G ; B m
2) PabloDraw/TundraDraw. CSI 0/1 ; R ; G ; B m

These use a temporary internal palette of 15840 entries to ensure what's
on the screen is correct.  Scrollback data may be incorrect however.

(that support DCS strings).  With this, CSI = Ps1 ; Ps2 { is deprecated and
should not be used when CTerm is newer than this commit (1.213).

Docuement CSI < c
Use the ECMS-48 style notation.

1) The colour values are expressed as a percentage, not a 0-255 value.
2) Implement CSI ? 80 h/l to set/reset the sixel scrolling mode (defaults to
   set).
3) Document sixel commands.
4) Combine the extended set/reset mode commands in the documentation now
   that multiple modes can be set or reset with a single sequence.

CTerm (and therefore SyncTERM 1.0) required an extra two ignored garbage
bytes in the font data.

ESC ] 104 ESC \ will reset all palette entries.
ESC ] 104;X;Y... ESC \ will reset specified palette entries only.

ie: perl -e 'print "\e]104;1;2\e\\"'
Will reset palette entries 1 and 2.

ESC ] <string> ESC \

Where string is in the format:
rgb:R/G/B
And the values of R, G, and B are one to four hex digits.  For example:
"\e]4;1;rgb:0/0/a8" will reset the blue entry to the default value.

These basically never worked as documented.  Now they should, but they can't
save/restore the doorway mode setting since it's not set/cleared using
CSI ? h/l.  If that's really needed (you need to know the doorway state
regardless, so it's more likely that a query doorway command is needed if
anything) it can be added as a separate command.

1) Use a functional default (1) for P1.
2) Respond with an empty P2 parameter if nothing is set.
3) Only respond if there is a single parameter.  If there is more than one,
   it's not a request.

While we're here, clean up the formatting of cterm.txt.
Tabs for indentation, spaces for alignment, don't wrap with 80-column
displays using 8-char tabs (default with more).  The ECMA-048 reference
will always wrap however.

the DA response, so I added 2 new requests: CSI=1n and CSI=2n which query
a state report from the terminal (for font state or video/emu mode), the same
information returned in the DA in the previous rev, but in a format more in
line with the corresponding CSI? N h/l requests (no bit checking required).