chore: reworked reference component

feat: implemented tests for encoding/decoding

comparison allen v3, ~580 regions selected:
- pre 2019 May release: 2854 char
- post 2019 May release: 7390 char
- this patch: 1997 char

maintaining backwards compat

Includes cookie acknowledgement fix and panel minimise and close buttons fix

nb: name is needed for backwards compatibility.
TODO implement tests for backwards compat

deprecate: mouseOverNehuba api