Really, a single source of truth for the version major.minor number now.

Use math to compute the value of VERSION_NUM and VERSION_HEX so we don't have
mutliple sources of truth for the integer-encoded version number any longer.

Makes it nicer to read through looking for specific commands

These all have slightly different semantics (that don't matter yet),
so split the up appropriately.

I really shouldn't be doing this though. :(

This allows for a way to save/restore the cursor position when
DECLRMM is enabled.

Saves to the same variables as SCOSC/SCORC.

Document that ANSI.SYS is what's implemented, and indicate how this
can be extended.

Closes issue #896

These are zero-based like the properties, not 1-based like gotoxy()

We only do this in the terminal server... to detect this, check if the
global object has a bbs object that is of the BBS class.  If it does,
the context private will be an sbbs_t pointer.

For now, this is a quick hacky fix.  The web server does not store
an sbbs_t in the context private, so we can't use it here.

This needs further work.

Initial design of Terminal class

See merge request !506

Better/more obvious "-1" bytes/size logged when flength() returns failure.

This broke showmsgavatar.js

Examples:
"-D02/29/25"
"-T02 Feb 1996 03:04:05 GMT"
"-TDecember 17, 1995 03:24:00"
"-T1995-12-17T03:24:00"

The system's configured time zone is always used however.

Translate the blink attribute to the bright BG attribute.
This won't work for XBin however since XBin expects that setting
the blink attribute will not change the background colour... and
since it tends to use blink for everything, this means XBin images
will be shown with a bright background.

DDMsgReader: When reading messages (including sent email), only mark it read if it's to the current user. Reported by Accession.

See merge request !521

DDMsgReader: When reading messages (including sent email), only mark it read if it's to the current user. Reported by Accession.

The last item was being cut off on my system (uninitialized value)

To be consistent with how sbbs[.exe] works

To be consistent with how sbbsctrl.exe works

Don't save player if player is undefined.

Presumably someone is sitting at the intitial menu until they run
out of time on the BBS.  The error was completely harmless.

C64 doesn't have a backspace key, so treat backspace the same as
DEL.

Closes tick 197.

This should fix issue #893, but it's hard to tell for sure, the docs
for JSON db are a bit sparse.

Throw an error instead.  This should help DigitalMan debug his issue.