Added a four-way split view with three orthogonal and one perspective view

|SOURCe|
[BloodBulletEditor]
* Added a split view and attached three orthographic and one perspective view
[OrthographicViewControl]
* Each orthographic view can specify the plane being viewed (XZ, XY, YZ)
* For testing, the three planes specify whether the clear colour is red, green,
  or blue
[PerspeciveViewControl]
* This is intended to render the level with a 3D perspective