Optimize/enhance physics calculations and collision detection/resolution.

[Altanis]

• Merge CollisionResolver.detect and CollisionResolver.resolve functions (many overlapping calculations between the two).
• Optimize spatial hashing detection.
• Return Entity[] from spatial hashing in O(1) time rather than iterating over query array.
• Optimize out the Set functions, as they are extremely slow.
• Remove refreshBounds, and make bounds simply a getter (experiment effect on perf)
• [?] Detect parallel line segments to minimize the amount of axis projection calculations.

[Altanis]

Spatial hashing detection can be optimized a little bit further, progress updates on optimizations will be neglected until core features are finished.

[Altanis]

Spatial Hashgrid optimizations are required:

• Remove duplicate entity collision detections.

[Altanis]

A possibility to eliminate axis checking of parallel lines may be useful.