BAR105 Smooth Mesh dynamic updates

[marcushutchings]

Smooth Mesh will now respond the changes in the heightmap during gameplay. Algorithm changed to reduce computational load. Typically peaks at 0.1% CPU for me; though, I've seen very rare spikes a little higher 0.3-0.4%. It was able to keep up nicely with a 6v6 Barbarian match.

Optmizations include:

• Switching Gaussian blur for Linear blur
• Removal of blur kernel
• Use of rolling averages instead of recomputing them at every point
• Smooth Mesh is strictly aligned with heightmap to remove the need to interpolate during maxima calculations
• Use of SSE to speed up calculating local maximas
• The map is divided into tiles of 64m by 64m, which are now the processing elements used in updates
• Damage is tracked by tile, so already damaged tiles are not added to the pipeline a second time
• Dynamic updates are delayed and then submitted through a pipeline
• The pipeline will do a single piece of work on a single tile per sim frame
• The pipeline will process all tile maximas first, then all tile horizontal blurs, and then finally all tile vertical blurs this avoids artefacts from appearing in the smooth mesh
• Multi-threaded workloads have been turned to single threaded workloads because the work load is too small for multi-threading.

I have added a Mod Option to disable the SmoothMesh (and hence the dynamic updates.) It will be on by default. Set system.enableSmoothMesh = false to disable.