r1048 - Scripting Additions and Fixes

• Player's move speed is effect now by moveSpeed
• Move speed greater than 1 will allow faster movement than 1 now
• Changing rifle to use rifle ammo again and not pistol ammo
• Adds the ability to execute a script on the various movement key presses and stop them from occurring 
• keyID has the key pressed and keyState has whether the key was pressed down/up
• If the last line returns false then it will be as if the player didn't press that key
• keyboard.keyForwardScript - Script to run when pressing forward
• keyboard.keyBackScript - Script to run when pressing back
• keyboard.keyLeftScript - Script to run when pressing left
• keyboard.keyRightScript - Script to run when pressing right
• keyboard.keyJumpScript - Script to run when pressing jump
• keyboard.keySneakScript - Script to run when pressing sneak
• Added functions/variables to EntityLiving
• gravity - Controls how fast this entity falls
• jumpVelocity - The upward y velocity upon jumping
• jumpWallMultiplier - The upward y velocity upon jumping against a wall will be this number multiplied by jumpVelocity
• jumpInAirMultiplier - The upward y velocity upon jumping in the air will be this number multiplied by jumpVelocity
• shouldJump - Says whether this entity should be trying to jump or not
• airControl - The multiplier for how much the player can effect their horizontal velocity while in the air
• void fireBullet(float spread, int damage) - Fires a bullet using the entities position and facing. Spread effects how much randomness is added to the bullets trajectory.
• Added to Entity
• hitVec3, blockHit, entityHit = rayTrace(ScriptVec3 start, ScriptVec3 end) - Traces from the start coordinate to the end coordinate.  If something is hit then hitVec3 won't be null.  Then whether a block or entity was hit the corresponding variable will not be null. This will ignore this entity during the ray trace.
• hitVec3, blockHit, entityHit = rayTrace(startX, startY, startZ, endX, endY, endZ) - Traces from the start coordinate to the end coordinate.  If something is hit then hitVec3 won't be null.  Then whether a block or entity was hit the corresponding variable will not be null. This will ignore this entity during the ray trace.
• Added to World
• hitVec3, blockHit, entityHit = rayTrace(ScriptVec3 start, ScriptVec3 end) - Traces from the start coordinate to the end coordinate.  If something is hit then hitVec3 won't be null.  Then whether a block or entity was hit the corresponding variable will not be null.
• hitVec3, blockHit, entityHit = rayTrace(startX, startY, startZ, endX, endY, endZ) - Traces from the start coordinate to the end coordinate.  If something is hit then hitVec3 won't be null.  Then whether a block or entity was hit the corresponding variable will not be null.
• hitVec3, blockHit = rayTraceBlocks(ScriptVec3 start, ScriptVec3 end) - Traces from the start coordinate to the end coordinate. If a block is hit then hitVec3 has the position hit and blockHit the block's coordinates.
• hitVec3, blockHit = rayTraceBlocks(startX, startY, startZ, endX, endY, endZ) - Traces from the start coordinate to the end coordinate.  If a block is hit then hitVec3 has the position hit and blockHit the block's coordinates.