fixup issues 440 441 479
cmd buffer overflow test simplified
Backported 2e3729ab2268f29ee4ff5898f629c4a10c2d6587 to master; redo assemblePath for Win. redo openscad.com to handle spaces in filenames
Editor: Implemented simple Find functionality

Conflicts:
	src/MainWindow.h
Editor: Reduce find panel bottom margin
Editor: Implement Search & Replace

Conflicts:
	src/MainWindow.h
Editor: Subtle UI Tweak

Return in the find or replace field will animate the triggered button
Editor: Fix bug where replaceAll could enter an infinite loop
Remove automatic validity check at end of render

In more complex cases, the final Nef_Polyhedron is_valid check() took up to 30 % of the total rendering time just to be able to say Valid: YES. In the case of cached geometry, the validity check was totally dominating the execution time when doing a render. This patch removes the automatic validity check, instead adding a menu command "Check Validity".

Conflicts:
	src/mainwin.cc
Moved % modifier handling from node to nodedumper. This makes nodes with % operators use the existing cache instead of recalculating the object
sync
fix related to 6a1d91dc76ec819e85b180b8cdaf40ddd639a538
Backported #638 from unstable
Use homebrew-built libraries, use actual # of CPUs
Added test for #535
Cleaned up some module cache misbehaviors. Fixes #535
cosmetics
Added test for #181
Fixed a bug failing to detect changes in underlying libraries. Should improve some of the issues reported in #181
#504 Updated example: child() -> children()