fix(tab) - focus, tab selection, and ink updates

Active tab changes now syncs with focus; which fixes navigation issues with arrow keys
Default tab selection no longer sets focus
Fixed RTE when `noInk` attribute is specified
Click on disabled tabs no longer changes focus
fix(build) - regexp for doc demo CSS

Improved RegExp rule for matching CSS rules.
Updated Tabs Demo #2 remove button positioning
refactor(tabs): refactor for simplicity, bug fixes
refactor(): start moving to src/core, remove ARIA, EVENTS constants