Overhaul the template.

- DATA and RODATA segments added to computer.cfg
 - RAM memory configuration now starts at  to not overwrite the cpu stack
 - hardware.inc added to handle hardware related constants
 - constants removed from via.s
 - constants removed from serial.s
 - serial_delay from serial.s is now dynamic, dependant on CPU_HZ and baud rate
 - serial_baud_* functions added to setup 19200 and 9600 baud
 - mem_copy.s added. data copy functions are to be implemented here
 - copy_data (mem_copy.s) implemented to copy the DATA segment from ROM to RAM
 - propper system setup in main.s
 - Makefile now generates a .map file with the memory map information

computer.cfg

@@ -1,7 +1,7 @@
 # Physical Memory configuration
 MEMORY {
     ZP:     start = $00,    size = $0100,   type = rw,  file = "";
-    RAM:    start = $0100,  size = $7e00,   type = rw,  file = "";
+    RAM:    start = $0200,  size = $7d00,   type = rw,  file = "";
     PRG:    start = $C000,  size = $4000,   type = ro,  file = %O,  fill = yes, fillval = $00;
 }
 
@@ -10,5 +10,7 @@ SEGMENTS {
     ZEROPAGE:   load = ZP,  type = zp;
     BSS:        load = RAM, type = bss;
     CODE:       load = PRG, type = ro, start = $C000;
+    DATA:       load = PRG, run = RAM, type = rw, define = yes;
+    RODATA:     load = PRG, type = ro;
     VECTORS:    load = PRG, type = ro, start = $FFFA;
 }