lcl: create TCustomBitmap from resource according to stream format instead of PNG only

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@43069 4005530d-fff6-0310-9dd1-cebe43e6787f
rtti controls: use FPC resources for component images

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@43070 4005530d-fff6-0310-9dd1-cebe43e6787f