New powerups, balances, and improved the Desert Boss!

- Added 'Health Scale' Powerup. - Added 'Velocity Damage' Powerup. - Added 'Dark Pact' Powerup. - Made Ray of Negative Energy slightly stronger. - Made Light and Dark blades slightly stronger. - Added more variety in NPCs movement. - Added damage / resistance data when debug data is shown. - Added 'Insect' tag to some monsters instead of 'Animal'. 'Animal Domination' will also affect insects, so no change there. - Changed the 'Desert Lord' stats and behavior to make him more interesting. - Made 'Holy Damage' effect still apply on monsters with damage immunities. - Added tags to some bosses and monsters. - Added visual effect for Dark Damage. - Fixed 'Bear Trap' and 'Sigil of Trapping' to not affect bosses and special units. Edit: Also fixed bug with exploding chickens causing a crash in the short-range mission in The Climb.