Annotation Tools: Explicit typecasting === changes and reorganizing plugins
 - replaced tabs with 4 spaces

 - fixed spaces after commas, if conditions, braces, operators
 - fixed some typecasting issues as well

 - added missing semicolons
Merge pull request #4796 from lduarte1991/lduarte-harvardx-pr18

Annotation Tools: Fixing implicit typecasting and reordering plugins
BLD-1125: Validation of content experiments after managing a group.