ChmHelp & Democontrol: add right lhelp path for Windows. Cleanup.

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@43181 4005530d-fff6-0310-9dd1-cebe43e6787f
IDE: Compare TargetOS without case sensitivity. The default value is lowercase.

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@43182 4005530d-fff6-0310-9dd1-cebe43e6787f