[ATARI] Altirra 2.0 test I/II

Version 2.00 test 2:

• Sorry, there was a regression in ANTIC due to a fix that hadn't gone over yet.

Version 2.00 test 1:

features added

• UI: Added OS Screen size setting.
• UI: Added support for gzip compressed images (*.gz, *.atz).
• UI: Arrow key behavior is now configurable.
• Debugger: Added command aliases (ac, al, as, a8).
• Debugger: Added watch expression (wx) command.

bugs fixed

• ANTIC: Added emulation of bus data displaying at the very right border of a wide scrolled playfield.
• ANTIC: Improved accuracy of mid scan line changes to HSCROL.
• ANTIC: Fixed phantom DMA data during WSYNC.
• ANTIC: Implemented phantom DMA artifacts along right side of wide playfield.