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.

libsrc/sim6502/paravirt.s

@@ -0,0 +1,16 @@
+;
+; Oliver Schmidt, 2013-05-16
+;
+; int open (const char* name, int flags, ...);
+; int __fastcall__ close (int fd);
+; int __fastcall__ read (int fd, void* buf, unsigned count);
+; int __fastcall__ write (int fd, const void* buf, unsigned count);
+;
+
+        .export         exit, _open, _close, _read, _write
+
+exit            := $FFF0
+_open           := $FFF1
+_close          := $FFF2
+_read           := $FFF3
+_write          := $FFF4