Translation support

[nmlgc]

Very open-ended, and basically the sum of a bunch of little features that I can deliver independently, depending on how much money comes in:

• Dump the original script in the translatable format
• Add a language setting to the Config menu (depends on Introduce a version system for 秋霜CFG.DAT #34)
• Dumb line-by-line replacement for in-game dialogue, endings, and UI text
• Dynamically growing the text box to fit more than 4 lines of dialogue (much better suited for this game than inserting new text boxes)
• In-game previewing (think thcrap skipgame/instant_ending)
• Automatic line breaks for in-game dialogue, endings, and the Music Room
• Image translations (we can pretty much copy the sprite-based overlay algorithms from thcrap_tsa there)
• The ultimate bonus feature: In-engine textbox editing