Fully implemented ConVar class so we could statically construct all SDK convars, this avoids a level of indirection, and allows for creating ConVar's everywhere in the project.
This patch also removed the settings tab of the ImGui server browser, as it has threading issues, while it technically never caused a crash yet, it has been removed as there was no point keeping it vs the work required to make it thread save (it only managed 2 convars which are perfectly manageable through cfg's or the in-game console).
Also temporarily disabled the creation of ConVar's in the mod system due to a memory leak, we would allocate and register a convar based on details parsed out of a mod file definition, but never unregister and free it.
The min spec is SSSE3, using SSE4.1 instructions (_mm_extract_epi64) will break compatibility. The code containing the defect is debug only, and %90+ of the user base uses an SSE4.1 capable processor.
* Use mathlib SIMD wrappers instead, this is to maintain compatibility across different platforms/compilers.
* Moved camera distance logic to separate method.
Uses the same camera range cvar used by the NavMesh renderer: 'navmesh_debug_camera_range'. This allows for rendering them nicely on top of the NavMesh.
* Make box's mins and maxs static const.
* Use SSE to pack 4 indices into 1 128bit register, and shuffle to prevent duplication. Only 2 indices are used at the moment.
* Init vCamera once during call (MainViewOrigin() won't change during the execution of this function).
* Construct Vector3D for camera distance only once, using SIMD.
Obtain values of ConVar once a frame instead of checking within loop. There is no point changing the values while we are rendering. Thi sshould increase performance when drawing larger NavMeshes.
* Construct min/max for AI Script Network boxes using SIMD (significantly reduced instruction count!).
* Move NavMesh debug draw to dedicated class for future changes.
* Use SIMD to construct vertices into single XMM register.
* Use SIMD to construct origin and destination vectors from vertices.
* Deref 'navmesh_debug_camera_range' only once outside the render loop.
* Light code cleanup.
* Use SIMD to construct a Vector3D in a single instruction, instead of setting the vector fields individually.
* Store ConVar value as const bool outside loop.
* Slightly improved variable naming.
* Move AIN/NavMesh debug draw to ai_utility_shared.cpp.
* Use shift index + range for AIN debug draw.
* Added cvar for determining max distance between camera and tile (anything outside this range doesn't get draw).
