Add NES building and adapt example functions

LibMultiSpacc/neslib/vram_unrle.s

@@ -0,0 +1,60 @@
+
+.importzp TEMP
+.include "nes.inc"
+.include "zpvars.inc"
+.export _vram_unrle
+
+;void __fastcall__ vram_unrle(const unsigned char *data);
+
+_vram_unrle:
+
+	tay
+	stx <RLE_HIGH
+	lda #0
+	sta <RLE_LOW
+
+	lda (RLE_LOW),y
+	sta <RLE_TAG
+	iny
+	bne @1
+	inc <RLE_HIGH
+
+@1:
+
+	lda (RLE_LOW),y
+	iny
+	bne @11
+	inc <RLE_HIGH
+
+@11:
+
+	cmp <RLE_TAG
+	beq @2
+	sta PPU_DATA
+	sta <RLE_BYTE
+	bne @1
+
+@2:
+
+	lda (RLE_LOW),y
+	beq @4
+	iny
+	bne @21
+	inc <RLE_HIGH
+
+@21:
+
+	tax
+	lda <RLE_BYTE
+
+@3:
+
+	sta PPU_DATA
+	dex
+	bne @3
+	beq @1
+
+@4:
+
+	rts
+