[FIX] Angular submodule changed to Indico fork

* Branch of the submodule set to port-fix
[FIX] RegForm: Removed hard-coded port
[FIX] RegForm: disable/enable sorting not synced
[IMP] RegForm: Removed Label/Checkbox unused opts

- Also, code cleanup and style tweaks
[NEW] Angular: ndInitFocus directive

- Directive for initializing the focus on an element
[FIX] RegForm: Added phone field regex validation

- Needed as the validation is also performed in the backend
[DEL] Removed submodule Angular
[FIX] Added submodule Angular (indico fork)