binds...
* doubleClick/Enter in Entity inspector Class list = convert entities
* ctrl during creating brush = cube brush
misc...
* on worldspawn entity create/convert to one do most expected move-selected-primitives-to-worldspawn
* convert point entity to group one = placeholder brush at origin + remove origin key
* convert group entity to point one: set origin key to contained primitives center
* fix uniform rotation operations for eclassmodel, miscmodel entities
* scale miscmodel entities uniformly
* added func_detail to world and detail filters
* region->set_xy: using active projection, not just xy one; is subtractive (no region off before applying)
* new brush prefab: icosahedron
* refactored CSGTool, improved Hollow::diagonal algorithm stability
improved view_cubiclipping.png
misc...
* restrict unwanted angle(s) keys commits on moving generic, eclassmodel, miscmodel entities
* reverted angle(s), origin, scale entity keys save format from %f to %g
* fix uniform rotation operations for generic entities with angles key
* use more precise meth for rotating point entities with only angle rotated
* snap tiny inaccuracies in angle(s) and origin point entities keys
* workaround: don't discard empty group ents, having origin key
* entity class convertion: prevent converting worldspawn; prevent converting point entity to empty group
