lcl: load TBitmap only from RT_BITMAP resources. Other bitmap types should be loaded from RT_RCDATA since RT_BITMAP stream is not valid

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@42956 4005530d-fff6-0310-9dd1-cebe43e6787f
lcl: load button icons from FPC resources instead of Lazarus resources

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@42957 4005530d-fff6-0310-9dd1-cebe43e6787f