codetools: code completion: use GetIndentStr of beautifier

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@40814 4005530d-fff6-0310-9dd1-cebe43e6787f
codetools: moved CommentCode to TStdCodeTool

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@40815 4005530d-fff6-0310-9dd1-cebe43e6787f