Dual Casting and Mana system

In this update, the shooting mechanic has been upgraded to include a second spell that can be cast, with both spells being usable at the same time with LMB and RMB on the mouse. Mana was also introduced as a limit to how frequently you can use these abilities and will be an upgradable stat both for the size of your mana pool and for regeneration rate.

MAJOR CHANGES:

-mana system

-new spell to cast

-dual casting

MINOR CHANGES:

-double jump bug fix 

-treetops and ladders no longer obstruct projectiles and you can drop down from them by pressing S.

-walking and sprinting. Hold LShift to sprint, or toggle with LCtrl.