[ticket/12919] Use the modules basename as identifier for extension modules

PHPBB3-12919
[ticket/12922] Posts per page in MCP should have a min value of zero

In order to allow displaying the whole topic in MCP=>Main=>View topic,
the min value in the html input field must be 0.

PHPBB3-12922
[ticket/12922] Subsilver2 fix

PHPBB3-12922
Merge pull request #2810 from nickvergessen/ticket/12919

[ticket/12919] Use the modules basename as identifier for extension modules
[ticket/12903] Remove dead phpbb\extension\metadata_manager::_validate_version

PHPBB3-12903
Merge pull request #2821 from bantu/ticket/12903

[ticket/12903] Remove dead phpbb\extension\metadata_manager::_validate_version
[ticket/12535] Make <a> adjust to the image width

PHPBB3-12535
[ticket/12535] Add events to subsilver2

Forgot subsilver... yet again

PHPBB3-12535
[ticket/12535] Update events.md to RC3

PHPBB3-12535
[ticket/12535] Combine inner clearing CSS rules

PHPBB3-12535
Merge pull request #2816 from n-aleha/ticket/12922

[ticket/12922] Posts per page in MCP should have a min value of zero

* n-aleha/ticket/12922:
  [ticket/12922] Subsilver2 fix
  [ticket/12922] Posts per page in MCP should have a min value of zero
[ticket/12876] core.mcp_mcp_front.mcp_front_view_queue_postid_list_after

Adding the core.mcp_mcp_front.mcp_front_view_queue_topicid_list_after
event to mcp backend.

PHPBB3-12876
[ticket/12853] Hide moderator link if it is really necessary

PHPBB3-12853
Merge pull request #2829 from nickvergessen/ticket/12853

[ticket/12853] Hide moderator link if it is really necessary
[ticket/12744] Fix additional height of one line in header in rtl languages

PHPBB3-12744
Merge remote-tracking branch 'marc1706/ticket/12744' into develop-ascraeus

* marc1706/ticket/12744:
  [ticket/12744] Fix additional height of one line in header in rtl languages
Merge remote-tracking branch 'PayBas/ticket/12535' into develop-ascraeus

* PayBas/ticket/12535:
  [ticket/12535] Combine inner clearing CSS rules
  [ticket/12535] Update events.md to RC3
  [ticket/12535] Add events to subsilver2
  [ticket/12535] Make <a> adjust to the image width
Merge pull request #2762 from brunoais/ticket/12876

[ticket/12876] core.mcp_mcp_front.mcp_front_view_queue_postid_list_after

* brunoais/ticket/12876:
  [ticket/12876] core.mcp_mcp_front.mcp_front_view_queue_postid_list_after