small cosmetic update (indent)
Ticket #151 : Fix Combo (see details)

- fix entity instantiation when not using object pooling
- make `me.game.remove()` call `me.entityPool.freeInstance()` and not
the opposite (object can me removed using the regular `me.game.remove()`
function
- stop complaining about unfound entities in
`me.entityPool.freeInstance()`, so that non "pooled" object can be
removed without errors
- fix an issue with object (re)initialization (missing properties
initialization in the `SpriteObject` constructor)
- misc typo and variable renaming