Add test cases for Gameboy

Tests/Z80/GB Loads/GB Loads.asm

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+// Test Gameboy load opcodes, aliases and alternatives
+
+.gb
+.create "output.bin",0
+
+	// Load 8-bit immediate
+	ld	a, 0x00
+	ld	a, 0xFF
+	ld	b, 0x00
+	ld	b, 0xFF
+	ld	c, 0x00
+	ld	c, 0xFF
+	ld	d, 0x00
+	ld	d, 0xFF
+	ld	e, 0x00
+	ld	e, 0xFF
+	ld	h, 0x00
+	ld	h, 0xFF
+	ld	l, 0x00
+	ld	l, 0xFF
+
+	// Load 16-bit immediate
+	ld	bc, 0x0000
+	ld	bc, 0xFFFF
+	ld	de, 0x0000
+	ld	de, 0xFFFF
+	ld	hl, 0x0000
+	ld	hl, 0xFFFF
+	ld	sp, 0x0000
+	ld	sp, 0xFFFF
+
+	// Load and increment
+	ld	(hli), a
+	ld	(hl+), a
+	ldi	(hl), a
+	ld	a, (hli)
+	ld	a, (hl+)
+	ldi	a, (hl)
+
+	// Load and decrement
+	ld	(hld), a
+	ld	(hl-), a
+	ldd	(hl), a
+	ld	a, (hld)
+	ld	a, (hl-)
+	ldd	a, (hl)
+
+	// Load memory immediate
+	ld	(0x0000), a
+	ld	(0x1234), a
+	ld	(0xFEFF), a
+	ld	a, (0x0000)
+	ld	a, (0x1234)
+	ld	a, (0xFEFF)
+
+	// Load high memory immediate
+	ld	(0xFF00), a
+	ld	(0xFF00+0x55), a
+	ld	(0xFF55), a
+	ldh	(0xFF00), a
+	ldh	(0xFF00+0x55), a
+	ldh	(0xFF55), a
+	ldh	(0x55), a
+	ld	a, (0xFF00)
+	ld	a, (0xFF00+0x55)
+	ld	a, (0xFF55)
+	ldh	a, (0xFF00)
+	ldh	a, (0xFF00+0x55)
+	ldh	a, (0xFF55)
+	ldh	a, (0x55)
+
+	// Load high memory c
+	ld	(0xFF00+c), a
+	ld	(c), a
+	ld	a, (0xFF00+c)
+	ld	a, (c)
+
+	// Load stack pointer
+	ld	hl, sp+0x55
+	ld	hl, sp-0x56
+	ldhl	sp, 0x55
+	ldhl	sp, -0x56
+
+.close