IDE: Cleanup + unifying variable names.

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@42263 4005530d-fff6-0310-9dd1-cebe43e6787f
IDE: sanity checks in conditional defines window.

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@42264 4005530d-fff6-0310-9dd1-cebe43e6787f