Improved win scene animations

Fade out portraits and mana for all wizards but the winner.
Edited win scene. Actor faces fountain
Updated AI implementation

Add: Wizards will now check whether enemies are getting close (< 4)
tiles to the fountain and cast debuff spells against them. Rival wizard
types have precedence.
Add: Defensive spell. If < 3 tiles are left to the fountain, cast
Stone spells on the path.
Added multiple arguments to l10n str formatting function
Added spellcasting info in textbox
Updated README file
Finalized common AI decisions

Add: Tile and Buff lookup method in map.js
Add: Offenseive and Defensive common AI decisions
Updated README info
Updated HOWTO doc info
Updated AI refs
AI fixes

Fix: Out of bounds error when checking target for path abyss tiles
Add: Entria-Sil Path casting spell logic
Added new game menu screen and buttons