Aim assist

[bboudaoud-nv]

This branch adds support for a simplified aim assist to FPSci.

Supported features include:

• An FoV-based aim assist specified by aimAssistFoV in general configuration
• Ability to visualize the aim assist FoV using a custom color (aimAssistFoVColor) and width (aimAssistFoVWidth)
• Automatic invoking of aim assist on fire using aimAssistSnapOnFire
• Use of the autoAim key (now specified in the key map and defaulting to Tab) to snap aim (when aimAssistFoV > 0)
• Optional use of aim assist with reference (aimAssistOnReference) and real (aimAssistOnReal) targets
• Speed limiting for aim assist using aimAssistMaxSpeed parameter (in °/s)

[jspjutNV]

I tested this and it seems to work. It would be nice to have a sample to add to the repository, but we can always build that later.

The combo of aimAssistMaxSpeed and aimAssistSnapOnFire can give some weird behavior, but it's easy for the experiment designer to avoid those situations. We can always improve that behavior later.