[ticket/12858] Generate timezone selects with template loop

PHPBB3-12858
[ticket/12858] Use UTC for time info in footer and hide offset if it's 0

PHPBB3-12858
[ticket/12858] Remove hardcoded language entries from timezone selects

PHPBB3-12858
[ticket/12858] Fix timezone display on acp users page

PHPBB3-12858
[ticket/12858] Fix timezone select display in subsilver2

PHPBB3-12858
[ticket/12858] Rename tz_ prefixed block variables to timezone_ prefix

PHPBB3-12858
[ticket/12858] Directly return and use timezone selects

PHPBB3-12858
[ticket/12858] Properly format UTC offset in footer

PHPBB3-12858
Merge pull request #2844 from marc1706/ticket/12858

[ticket/12858] Remove hard-coded GMT from timezone drop-down and rename to UTC
[ticket/13087] Correctly link to user profile when contact field has no URL

Broken by 975c5655f0e9b65b7de3f2b832f1ef660a473832

PHPBB3-13087
Merge pull request #2993 from nickvergessen/ticket/13087

[ticket/13087] Correctly link to user profile when contact field has no URL
[ticket/13086] String replaces 50 with 20

PHPBB3-13086
Merge pull request #2994 from Skouat/ticket/13086-olympus

[ticket/13086] Update ACP_MASS_EMAIL_EXPLAIN language key

* Skouat/ticket/13086-olympus:
  [ticket/13086] String replaces 50 with 20
Merge branch 'develop-olympus' into develop-ascraeus

* develop-olympus:
  [ticket/13086] String replaces 50 with 20

Conflicts:
	phpBB/language/en/acp/email.php
[ticket/13105] Add a test for relative dates

PHPBB3-13105
[ticket/13105] Do not display future dates 2+ days ahead as "tomorrow"

PHPBB3-13105
[ticket/13104] inline-block -> block

PHPBB3-13104
[ticket/13106] Remove \phpbb\di\pass\kernel_pass.php

PHPBB3-13106
Merge pull request #2997 from Senky/ticket/13106

[ticket/13106] Remove the \phpbb\di\pass\kernel_pass class

* Senky/ticket/13106:
  [ticket/13106] Remove \phpbb\di\pass\kernel_pass.php
Merge pull request #2995 from nickvergessen/ticket/13105

[ticket/13105] Future relative dates are always displayed as "Tomorrow"

* nickvergessen/ticket/13105:
  [ticket/13105] Do not display future dates 2+ days ahead as "tomorrow"
  [ticket/13105] Add a test for relative dates