report version on startup
separate vdg control lines

Data is interleaved with !A/S and INV attributes, mode setting separates
!INT/EXT from GM0.
move video windowing into video modules

Simplifies the core VDG rendering at the expense of a few more calls
out to the video module render_scanline.
rename vdg -> mc6847
mc6847: allocated dynamically
snapshots: reset machine after configuring
Add Control+Shift+I to toggle inverse text
Add inverse toggle to GTK+ interface
Add inverse toggle to macosx interface
remove doc/version.texi from git
ChangeLog update
link xroar with -lm
docs: list Control+V in key shortcut summary
gtk: fix glade header deps
add -ext-charset option