lazutils: TMethodList: added AllowDuplicates, default false

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@44331 4005530d-fff6-0310-9dd1-cebe43e6787f
IDEIntf: added TAbstractIDEOptions handler destroy

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@44332 4005530d-fff6-0310-9dd1-cebe43e6787f
IDE: build IDE: use default compiler, not compiler of project

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@44333 4005530d-fff6-0310-9dd1-cebe43e6787f