[ticket/12729] Add Facebook custom profile field
* Dragooon/ticket/12729:
[ticket/12729] Add functional test for Facebook field
[ticket/12730] Values needn't be escaped for schema_data.sql
[ticket/12729] Set field_active as 1 for Facebook profile field
[ticket/12729] Add unit test for ALPHA_DOTS validation
[ticket/12729] Move ALPHA_DOTS to above ALPHA_SPACERS
[ticket/12729] Convert spaces to tabs
[ticket/12729] Fix block header spacing for profilefield_facebook.php
[ticket/12729] Update schema.json
[ticket/12729] Unnecessary whitespace in profilefield_facebook.php
[ticket/12729] Cleanup schema_data.sql for Facebook field
[ticket/12729] Add Facebook custom profile field