add yaze.asm and include mosaic_change.asm

assets/asm/yaze.asm

@@ -0,0 +1,15 @@
+; =========================================================
+; yaze custom assembly code 
+; =========================================================
+
+namespace yaze
+{
+
+!YAZE_CUSTOM_MOSAIC = 1
+
+if !YAZE_CUSTOM_MOSAIC != 0
+  incsrc "mosaic_change.asm"
+endif
+
+}
+namespace off