More improvements

Note: the game still hasn't been tested beyond the first dungeon following all these changes :)
- Add command-line ability to grant party XP and coin.
- Add some testing of combat outcomes. This includes some balancing and tweaking of the combat algorithms.
- Add zooming of display using scroll wheel.
- Add drag-grabbing to scroll map around.
- Add grab-hand feedback in generic UI.
- Visually indicate when an attack misses.
- Characters now informed when an attack on them misses.
- Spells are able to alter difficulty based on circumstance.
- NPCs now communicate and use their memory of PC locations.
- Optimisations in NPC path generation.
- Use GL_NEAREST when scaling up weapon sprites.
- Fix menu styling across board, including scaling.
- Fix bug introduced into assigning experience.
- Fix broken bashing action.
- Fix save/load of abilities.
- Some additional code cleanup removing out-of-date dags.
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Try running with the --nomusic command-line option.