Strife: Zones, Music and Two Handed Weapons

- Implemented Zones.
- Music fades out when you enter a new zone and after a while zone specific music will play.
- Extended weapon system. Weapons now rest on characters' back when not in use. Added 4 weapon types: Unarmed, 2 handed swords, 2 handed staves and 2 handed axes. Depending on the weapon type equipped attack stance and strike animations will change.

Video followed by some screenshots.

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