CMS-2047 Ensure that no built-in input type are instancable outside it's package
CMS-2052 Ensure that a built-in InputType cannot be inherited

All class and constructor access modifiers were removed from classes inherited from InputType
Classes were made final
Merge pull request #360 from enonic/CMS-2047

CMS-2047 Ensure that no built-in input type are instancable outside it's...