Scan Shader and HUD overhaul

* Implemented Scan Shader
- Made shader script, textures and material
- Made simple script to attach Scan Shader during Runtime

* Overhauled HUD System
- HUD is no longer attached to player but is a separate system,
accesible by the service locator
- Made HUDObjects to implement separate HUD widgets
- Made HUDPanels to aggregate Objects and made them render according to
priority
- Made HUD System classes, auxiliaries and MainPanel
- Did not made activate/deactivate interfaces yet, as do not know if
we'll need it
- Updated Main to have HUD system initialized similar to other
Monobehavior based systems