[IMP] website snippet: add onfocus, onblur, onclone and onremove on snippet options; fix banner id
[MERGE] from trunk
[IMP] website snippet option: rename data-class into data-value
[IMP] website snippet: add onblur, onfocus, onremove, onclone method on snippet options. Change data-class into data-value for designer comprehention; fix slider unique id
[FIX] website: set inherit_branding in test contexts to trigger generation of relevant edition attributes