Added 'sim6502' and 'sim65C02' targets.

The targets allow to run cc65 programs in the sim65 exection
einvironment. As there are no "real" i/o facilities there's no
need for header files. Paravirtualized entry points are mapped
to $FFF0 ff. There's a large cc65 progam area from $0200-$FFEF.

The binary format includes a one-byte header indicating the required
execution environment: The value 0 means 6502 and the value 1
means 65C02. The load adress for the binary is fixed to $0200.

Note: Running sim65C02 programs currently doesn't work bcause
sim65 doesn't actually implement 65C02 opcodes.

src/common/target.h

@@ -73,6 +73,8 @@ typedef enum {
     TGT_NES,
     TGT_SUPERVISION,
     TGT_LYNX,
+    TGT_SIM6502,
+    TGT_SIM65C02,
     TGT_COUNT                   /* Number of target systems */
 } target_t;