Add system-specific boot symbols and CPU instruction tests

Introduced symbol files for various Game Boy systems (CGB, AGB, MGB, SGB) to define boot sequences and functionalities. Included CPU instruction behavior tests, with detailed coverage of standard operations and interrupt handling. Added documentation for test execution and internal framework operations.

cpu_instrs/source/common/gb.inc

@@ -0,0 +1,64 @@
+; Game Boy hardware addresses
+
+; Memory
+.define VRAM   $8000 ; video memory
+.define TILES  $8000 ; tile images
+.define BGMAP0 $9800 ; first 32x32 tilemap
+.define BGMAP1 $9C00 ; second 32x32 tilemap
+.define WRAM   $C000 ; internal memory
+.define OAM    $FE00 ; sprite memory
+.define HRAM   $FF80 ; fast memory for LDH
+
+.define P1     $FF00
+
+; Game link I/O
+.define SB     $FF01
+.define SC     $FF02
+
+; Interrupts
+.define DIV    $FF04
+.define TIMA   $FF05
+.define TMA    $FF06
+.define TAC    $FF07
+.define IF     $FF0F
+.define IE     $FFFF
+
+; LCD registers
+.define LCDC   $FF40 ; control
+.define STAT   $FF41 ; status
+.define SCY    $FF42 ; scroll Y
+.define SCX    $FF43 ; scroll X
+.define LY     $FF44 ; current Y being rendered
+.define BGP    $FF47
+
+.define KEY1   $FF4D ; for changing CPU speed
+.define VBK    $FF4F
+
+; Sound registers
+.define NR10   $FF10
+.define NR11   $FF11
+.define NR12   $FF12
+.define NR13   $FF13
+.define NR14   $FF14
+
+.define NR21   $FF16
+.define NR22   $FF17
+.define NR23   $FF18
+.define NR24   $FF19
+
+.define NR30   $FF1A
+.define NR31   $FF1B
+.define NR32   $FF1C
+.define NR33   $FF1D
+.define NR34   $FF1E
+
+.define NR41   $FF20
+.define NR42   $FF21
+.define NR43   $FF22
+.define NR44   $FF23
+
+.define NR50   $FF24
+.define NR51   $FF25
+.define NR52   $FF26
+
+.define WAVE   $FF30