More corrupt area tweaks

navmesh_iscorrupt tweaks
Yap if no navmesh
Dont round the corrupt ratio into the ground

sanity collision check before placing seeds

Add commands for finding/removing corrupt areas

More guardrails to stop batch generation from getting out of hand, causing crashes.

"skybox area" detection tweaks

Add "Skybox navarea" finding/removing functionality.

Fix ladder creating commands sometimes snapping to the wrong ladders.

increase batch size for generate_cheap_expanded if it's not creating any areas

Change "corrupt" ratio to >0.15 of all navareas

Add new command "navmesh_iscorrupt"
+ global func navmeshIsCorrupted()

generate_cheap_expanded improvements ( less crashing on massive maps! )
navmesh_delete_allareas crashing on massive maps fix

Generation, and optimizing commands now flash the window when they finish.

Manual ladder building command gives a bit of wiggle room.

Made generate_cheap_expanded much more thorough.

Improve console prints.

New file, moved displacement trim to it
Added navmesh_trim_deepunderwater_areas and helper func navmesh_delete_allareas

Big changes
Overall polish in all areas

Optimizer commands don't freeze your game anymore
Fixed "nav_edit 1" sticking around for too long.


Added hooks;

navoptimizer_done_gencheapexpanded, Runs when *_generate_cheap_expanded is finished.
navoptimizer_done_globalmerge, Runs when *_globalmerge is finished.


Added ladder creating commands;

navmesh_ladderusable_build, Creates a navladder on the func_usableladder under your cursor
navmesh_ladderusable_buildmanual_snap, Same as above, but you can drag to resize the navladder
navmesh_ladder_buildmanual, Drag a ladder anywhere
navmesh_ladderusable_showall, Shows all unmeshed ladders via "developer 1" debug visualizers
navmesh_ladderusable_tp, Teleports you to the nearest un-navmeshed usableladder


Added experimental navmesh_patch_gap command
Allows for fast patching of doorways, vent entrances, etc.
Don't rely on this, it breaks often, in catastrophic ways.