iPro: Cleanup for iphtml.pas and other units.

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@45710 4005530d-fff6-0310-9dd1-cebe43e6787f
iPro: Refactoring. Split big methods in TIpHtmlNodeBlock into smaller ones.

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@45711 4005530d-fff6-0310-9dd1-cebe43e6787f