Added a select2 input for selecting tags

- Keeps the same functionality just with a new look
Fixed up require circular dependencies
Fixed circular dependency with rtGlobal
Fixed a bug where tags selector is not visible when there are no branches selected
Remove the stopchain flag logic
Merge branch 'cancelEntireBuildChain' into cancelEntireBuildChain2
Merge branch 'staging' into cancelEntireBuildChain2