IDE: add method "DoSaveEditorFile(const Filename: string; ..." to IDE interface. Analogous to DoCloseEditorFile method with Filename param.

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@40566 4005530d-fff6-0310-9dd1-cebe43e6787f
Converter: save all files after conversion.

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@40567 4005530d-fff6-0310-9dd1-cebe43e6787f