Refactoring NAFQA-158: Add Check for Helper and Controller rewrites
 - renamed protected methods and properties
 - common properties of plugin classes moved to ancestor Plugin class
Merge branch 'NAFQA-157' of https://github.com/NetresearchAppFactory/judge into NAFQA-158
Refactoring NAFQA-158: Add Check for Helper and Controller rewrites
 - fixed problems after refactoring
Implemented NAFQA-158: Add Check for Helper and Controller rewrites
Implemented NAFQA-158: Add Check for Helper and Controller rewrites
 – refactored Issue class
 – improved Rewrites check