New files for a component palette drop-down list.

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@42310 4005530d-fff6-0310-9dd1-cebe43e6787f
fpvectorial-svg: Fixes block reading, which was broken after a change in ReadEntityFromNode

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@42311 4005530d-fff6-0310-9dd1-cebe43e6787f