IDE: refactor OpenEditorFile() and OpenFileAtCursor() into a new TFileOpenClose. The diff is misleading, identical blocks were found around the code.

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@45677 4005530d-fff6-0310-9dd1-cebe43e6787f
IDE: refactor local functions from OpenFileAtCursor to private methods.

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@45678 4005530d-fff6-0310-9dd1-cebe43e6787f
IDE: refactor PrepareRevert out of OpenEditorFile.

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@45679 4005530d-fff6-0310-9dd1-cebe43e6787f
IDE: refactor PrepareInternalFile out of OpenEditorFile.

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@45680 4005530d-fff6-0310-9dd1-cebe43e6787f
IDE: use private variables in OpenEditorFile, harmonize parameter names.

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@45681 4005530d-fff6-0310-9dd1-cebe43e6787f