Adds the semver class with its tests.
See #226

Once this is merged, #213 and #215 need to be rebased on this.

This PR simplifies the controller logic by introducing a new class InsertManager.
InsertManager holds a list of possible Filters which filter keys based on OS, AppVersion or features activated.
The Filters are added at startup in the WSBaseConfig and allow for Filter activation by Profile or Property.

Additionally, the InsertManager can be configured with modifiers.
Modifiers can be used to modify keys before inserting into the datbase.

Replaces the previous g811a8d461394eecd25bd190c01b933cc177b7d05, according to #226

…g in class-variable

This PR updates the comments of the filters and modifiers to follow 'plain English':
http://www.plainenglish.co.uk/how-to-write-in-plain-english.html

Also changed ValidationUtils.checkForDelayedKeyDateClaim and its use in the KeysMatchingJWTFilter
which was wrong.

InsertManager cleanup

Simplify Exception Handling in controller and make InsertException abstract.

Split JWTClaims filter for Exposed and ExposedNextDay