targets: all
- checking residual space on banks if BANKED is used.
- added support for VARBANKPTR e VARBANK.
- refactorized bank access under all processors (6809, 6502, z80) and all targets;
- fixed optimizer under 6502;
- added missing declaration for cpu_mem_move_direct2_size;
- optimize BANK READ / BANK WRITE for 1,2 and 4 bytes;
- fixed optimization under 6809 to avoid exclusion of used temporary variables;
- allow BANKED arrays #728 under pc128op
- reordered memory variables to assure even access under pc128op;
- fixed bank filling with constants under pc128op;
- added BANK WRITE implementation under pc128op;
- fixed array assignment with multibyte constant (WITH).
- added support for BANKED on DIM definition;