removes nuke_ctl

- removes nuke_ctl in preparation for CTL 1.5 release.  nuke_ctl will be released in a future version CTL.
Merge branch 'nukeNode'.
Merge branch 'nukeNode'
Bump version to 1.5.3 and fix ctlrender unit test script.
Until we can figure out how to reliably run the ctlrender unit test from brew, don't use it.
Revise cmake incantations, adding back FindNuke.cmake and CMakeLists.txt (updating the latter for current Nuke plugin default search paths).
Fix typo in include file guard band that's been here for who knows how long.
Add back the ctlrender unit test though it probably doesn't work, so someone else can fix this.