[ticket/12696] Add events to ucp_register.html

Add events to UCP Register template:
ucp_register_before - add before start of registration form fields
ucp_register_after - add after end of registration form fileds
ucp_register_passowrd_after - add event after passowrd field
ucp_register_language_before - add event before language selector
ucp_register_profiles_before - add event just before begining of
registration profile informatiom

All events are inside the registration form fieldset.
All events are inside the registration form

Justification:

Add abbility of extension author to include custom
checks or fields inside the registration form.
Like age check field/verification.

PHPBB3-12696
[ticket/12696] Add prosilver ucp_register

Add events to prosilver ucp_register

PHPBB3-12696
[ticket/12696] Add events to evets.md

Add events in documentation

PHPBB3-12696
[ticket/12696] A small error with events.md perms

docs/events.md was in 755 changed to 644

PHPBB3-12696
[ticket/12696] Naming convention changes

Some changes propsed by nickvergessen

PHPBB3-12696
[ticket/12696] Change some parts

Change placment of ucp_register_profile_fields_before

PHPBB3-12696
[ticket/12696] Typo

Fixing typo

PHPBB3-12696
Merge pull request #2581 from lucifer4o/ticket/12696

[Ticket/12696] Add events to ucp_register.html

* lucifer4o/ticket/12696:
  [ticket/12696] Typo
  [ticket/12696] Change some parts
  [ticket/12696] Naming convention changes
  [ticket/12696] A small error with events.md perms
  [ticket/12696] Add events to evets.md
  [ticket/12696] Add prosilver ucp_register
  [ticket/12696] Add events to ucp_register.html
Merge branch 'develop-ascraeus' into develop

* develop-ascraeus:
  [ticket/12696] Typo
  [ticket/12696] Change some parts
  [ticket/12696] Naming convention changes
  [ticket/12696] A small error with events.md perms
  [ticket/12696] Add events to evets.md
  [ticket/12696] Add prosilver ucp_register
  [ticket/12696] Add events to ucp_register.html