Added support for non-addressable regions, which are useful for things
like file headers stripped out by the system loader, or chunks that
get loaded into non-addressable graphics RAM. Regions are specified
with the "NA" address value. The code list displays the address field
greyed out, starting from zero (which is kind of handy if you want to
know the relative offset within the region).
Putting labels in non-addressable regions doesn't make sense, but
symbol resolution is complicated enough that we really only have two
options: ignore the labels entirely, or allow them but warn of their
presence. The problem isn't so much the label, which you could
legitimately want to access from an extension script, but rather the
references to them from code or data. So we keep the label and add a
warning to the Messages list when we see a reference.
Moved NON_ADDR constants to Address class. AddressMap now has a copy.
This is awkward because Asm65 and CommonUtil don't share.
Updated the asm code generators to understand NON_ADDR, and reworked
the API so that Merlin and cc65 output is correct for nested regions.
Address region changes are now noted in the anattribs array, which
makes certain operations faster than checking the address map. It
also fixes a failure to recognize mid-instruction region changes in
the code analyzer.
Tweaked handling of synthetic regions, which are non-addressable areas
generated by the linear address map traversal to fill in any "holes".
The address region editor now treats attempts to edit them as
creation of a new region.
Most of SourceGen uses standard WPF controls, which get their default
style from the system theme. The main disassembly list uses a
custom style, and always looks like the Windows default theme.
Some people greatly prefer white text on a black background, so we
now provide a way to get that. This also requires muting the colors
used for Notes, since those were chosen to contrast with black text.
This does not affect anything other than the ListView used for
code, because everything else can be set through the Windows
"personalization" interface. We might want to change the way the
Notes window looks though, to avoid having glowing bookmarks on
the side.
