Add Mt. Moon Crater

The map functions and the ROM builds. It has no wild data, and nothing goes to it.

What's done;
- Map design, I think this is one of the best I've ever done, especially within these limits.
- Integration, set up a warp and you can go there, easy.

What's not done
- Wild data
- Fishing group
- Water mons
- Event signs
- Young Sada in Pewter Museum of Science

Very simple map to produce.

scripts/MtMoonCrater.asm

@@ -0,0 +1,6 @@
+MtMoonCrater_Script:
+	jp EnableAutoTextBoxDrawing
+
+MtMoonCrater_TextPointers:
+
+	text_end ; unused