Refactor internals

Api Changes

• components and inject do not get parsed first (follows the order of the set object)
• useVal is renamed to noReference
• useVal can not be used as a set overwrite
• mapProperty is renamed to property
• renamed .__input to .val
• removed .val getter
• renamed .parseValue to .compute
• uses stamp instead of event
• removed array functionality for references [ '$' , 'a', 'b' ]
• added parity with subscription to reference shortcut string notation $.a, $root.a and $.parent.a
• removed ":" detection in .property by default, it is easier to overwrite .property however
• contextGetters do not walk the parent chain
• do not have to use hasOwnProperty for _Constructor and _parent anymore
• path is immutable -- does not alter context of parents etc
• removed syncPath -- use realPath with second argument (memoize) true
• clearKeys requires a target -- will not clear all "keyLists" by default
• keys are integrated in base directly
• removed keyList property
• path is now a method instead of a getter

Performance

• most functionalities are around 15x faster
• optimised all hot-code-paths
• creating nested objects got 30x faster
• removed all hasOwnProperty checks

Structure

• split up most files
• full es6
• removed ambiguous property file -- now located in set/property/definition
• added more tests
• removed unused methods