Vice GP2X V1.20

- Added support for more 3rd party basic extenders to petcat.
- Added a c64/c128 cartridge conversion program (cartconv).
- Added binary distribution (package) creation functionality.
- Fixed a bug in the trap emulation with caused programs probing
devices on the IEC bus to fail.
- Lots of small fixes to the monitor.

** C64 changes
--------------
- Fixed some longstanding RMW to IO area VIC-II DMA timing bug.
- Added Mikro Assembler, Dela EP7x8, Dela EP256 and Rex EP256
cart support.
- Fixed the KCS cart emulation.
- Added swiftlink and turbo232 support.
- Added +256k memory expansion support.
- Added I/O source read collision detection support, making
simultanious use of multiple expansions possible, like on
the real machine.
- Fixed the RR-net address decoding and REU compatibility.
- Fixed a problem with traps using the SX Kernal ROM.
- Some IDE64 ultimax bug has been fixed.
** PET changes
--------------
- Added 128kb REU memory expansion support.

** PLUS4 changes
----------------
- Added 256k csory memory expansion support.
- Added 256k, 1024k and 4096k hannes memory expansion support.