[ticket/12233] Allow profile fields to be contact fields

Contact fields are displayed with in the contact section of the user profile
and are displayed differently in the mini profile next to posts and private
messages

PHPBB3-12233
[ticket/12233] Add images back to subsilver2

PHPBB3-12233
[ticket/12233] Update schema file

PHPBB3-12233
[ticket/12234] Replace ICQ with custom profile field

PHPBB3-12234
[ticket/12187] Add URL type for profile fields

PHPBB3-12187
[ticket/12187] Convert website field data to custom profile field

PHPBB3-12187
[ticket/12187] Remove user_website functionality

PHPBB3-12187
[ticket/12187] Remove user_website field

PHPBB3-12187
[ticket/12187] Split generate_profile_fields_template() into 2 methods

Removing the mode switch that wraps the content of the method

PHPBB3-12187
[ticket/12187] Do not make clickable when using as contact field

PHPBB3-12187
[ticket/12235] Convert WLM to custom profile field

PHPBB3-12235
Merge remote-tracking branch 'github-nickvergessen/ticket/12235' into develop

* github-nickvergessen/ticket/12235:
  [ticket/12235] Convert WLM to custom profile field
  [ticket/12187] Do not make clickable when using as contact field
  [ticket/12187] Split generate_profile_fields_template() into 2 methods
  [ticket/12187] Remove user_website field
  [ticket/12187] Remove user_website functionality
  [ticket/12187] Convert website field data to custom profile field
  [ticket/12187] Add URL type for profile fields
  [ticket/12234] Replace ICQ with custom profile field
  [ticket/12233] Update schema file
  [ticket/12233] Add images back to subsilver2
  [ticket/12233] Allow profile fields to be contact fields

Conflicts:
	phpBB/adm/style/acp_prune_users.html