Patch 1.16.1

Add-ons server

Fixed `core=` attribute in `_server.pbl` being completely ignored (issue #5664).

Campaigns

Tutorial
- Use a portrait on the Campaigns menu.

Sceptre of Fire
- S02p5: Added defeat condition if Alanin dies.

Multiplayer

Increased the limits of timer values (up to 10 minutes turn bonus, 50 minutes reservoir).
Re-added HTML character escaping.

Lua API

Fixed an error in `gui.get_user_choice()` (part of PR #6247).
Fixed an error in handling `x,y` locations (issue #6231).

Packaging

Fixed missing dependency on boost-math in the vcpkg config.
Made `get_dlls.py` install libraries for `wesnothd` too.

Translations

Updated translations: Dutch, Italian, Portuguese (Brazil).
Added po hints for time format strings.

User interface

Made the Add-ons Manager search box less unwieldy on very small resolutions.
Made listbox header toggle buttons taller.
Fixed a crash when assigning players to different teams while creating an MP game.
Fixed a crash when using nickname tab autocompletion in the MP lobby.

WML Engine

Fixed `[item]x,y=` at scenario scope (issue #6231).

Miscellaneous and Bug Fixes

Fixed missing tooltips on the side-bar (hover over the unit type to see a description, etc) (issues #6007 and #6096).
Fixed several issues in the multiplayer server about TLS connections, error-handling and disconnections.
Added `.DS_Store` and `Thumbs.db` to wmltool's list of files to ignore.