Code enhancement: fix clang warnings
- reduced visibility of tagMaxLen to AutoCompletion.cpp
- fixed missing init of BoostRegexSearch::_lastDirection, adapted also _substituted
- removed unused vars Printer::_nbPageTotal, FunctionListPanel::_hTreeViewImaLst
- fileBrowser.cpp(511,35): warning : equality comparison with extraneous parentheses [-Wparentheses-equality]
- ProjectPanel.cpp(595,35): warning : equality comparison with extraneous parentheses [-Wparentheses-equality]
- removed unused methods IsStateComment(), IsStateString() from LexObjC.cxx
- removed unused var KEYWORD_FOLDCONTRACTED from LexObjC.cxx
Close #13167
b9ab516c2c