Entity Modification Tool: Convert func_door bhop blocks to func_bhop

[jason-e]

We already have CMomentumBhopBlockFixSystem which does all of the detection and conversion of these entities when a map is loaded. For official maps, we should bake these conversions into the BSP for stability (after reviewing them to ensure their correctness).

Since CMomentumBhopBlockFixSystem is already implemented, it just has to be integrated with the Stripper porting system so it can include the func_bhop replacements in its Stripper configuration output.