this check prevents splitting on small brush fragments, where we actually need to split.
if we don't the small fragments cause incorrect leaf contents to be assigned.
re-introduce chop since it may be a key to the puzzle for hullnums
allow caller to do full fragmentation, add option to force it
fix BrushGE causing liquids, etc to be cut up
removed tree_t parameter from functions that don't need it
pass reference to tree_t instead of ptr
use an enum instead of std::optional<bool> for the ternary value to store split type, since it's more explicit and obvious now what the three values do
add more timers in a few spots
by default, display percent timers but don't display elapsed for non-verbose stuff (bmodels); this is so it still shows that it's "working" instead of just showing blank for large maps, give user an idea on progress for certain stuff
merge all "side not found"s into a single line
time `FillOutside`
time `ProcessMapBrushes`
time `Brush_LoadEntity`
fix logging::percent getting stomped in multi-threaded operations
add new stats facility to make creating lists of single-use stats easier to manage
fix SplitBrush storing a bunch of extra stats for ChopBrushes
use some explicit types (bspbrush_t::ptr for pointer, bspbrush_t::container for container of pointers, and bspbrush_t::make_ptr to create one) so that we can swap it out with different pointers easier later
swap out bspbrush_t::ptr from unique_ptr to shared_ptr; it's not important yet, but it does not increase compilation time and will allow us to pass things to functions like SplitBrush without destroying the original as long as we still have a reference to it somewhere (important for ChopBrushes)
add get_positive_plane to mapface_t
instead of creating a whole copy of the bspbrush_t list, BrushBSP now just creates copies of the shared_ptrs which are then filtered down the tree; the originals are never modified by SplitBrushList and friends, only split into new brushes, so this is safe from what I can tell
portals now directly reference the mapface_ts
original_brushes now directly reference the mapbrush_ts
early exit in `BrushBSP` if brush list is empty (moved to top)
Eric Wasylishen
Jonathan