Orthographic projection mode (for 2D visualisations) #114
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It's 'zoom' is tracked independently from the perspective projection mode. Projection mode can be toggled using F9, however perspective quickly misaligns ortho from an axis. Orthographic mode zoom modifier is shown in F1 panel when enabled.
Closes #8 (We don't have support for mapping discrete agents to a texture on a single 2D plane, but this provides a great approximation for 2D models without requiring huge API changes).