Merge branch 'master' into jgrpp

# Conflicts:
#	.github/workflows/ci-build.yml
#	.github/workflows/codeql.yml
#	.github/workflows/release-linux.yml
#	.github/workflows/release-macos.yml
#	.github/workflows/release-windows.yml
#	src/map.cpp
#	src/music/midifile.hpp
#	src/order_cmd.cpp
#	src/order_gui.cpp
#	src/pathfinder/yapf/yapf_rail.cpp
#	src/pbs.cpp
#	src/saveload/afterload.cpp
#	src/saveload/saveload.h
#	src/saveload/vehicle_sl.cpp
#	src/script/api/script_text.cpp
#	src/ship_cmd.cpp
#	src/train_cmd.cpp
#	src/vehicle.cpp
#	src/vehicle_base.h
#	src/vehicle_func.h
#	src/vehicle_gui.cpp
#	src/vehicle_gui_base.h
#	src/viewport.cpp
#	src/waypoint_cmd.cpp

.github/workflows/ci-emscripten.yml

@@ -0,0 +1,69 @@
+name: CI (Emscripten)
+
+on:
+  workflow_call:
+
+env:
+  CTEST_OUTPUT_ON_FAILURE: 1
+
+jobs:
+  emscripten:
+    name: CI
+
+    runs-on: ubuntu-20.04
+    container:
+      # If you change this version, change the number in the cache step too.
+      image: emscripten/emsdk:3.1.42
+
+    steps:
+    - name: Checkout
+      if: github.event_name != 'workflow_dispatch'
+      uses: actions/checkout@v4
+
+    - name: Checkout (Manual)
+      if: github.event_name == 'workflow_dispatch'
+      uses: actions/checkout@v4
+      with:
+        ref: ${{ github.event.inputs.ref }}
+
+    - name: Setup cache
+      uses: actions/cache@v4
+      with:
+        path: /emsdk/upstream/emscripten/cache
+        key: 3.1.42-${{ runner.os }}
+
+    - name: Patch Emscripten to support LZMA
+      run: |
+        cd /emsdk/upstream/emscripten
+        patch -p1 < ${GITHUB_WORKSPACE}/os/emscripten/emsdk-liblzma.patch
+
+    - name: Build (host tools)
+      run: |
+        mkdir build-host
+        cd build-host
+
+        echo "::group::CMake"
+        cmake .. -DOPTION_TOOLS_ONLY=ON
+        echo "::endgroup::"
+
+        echo "::group::Build"
+        echo "Running on $(nproc) cores"
+        cmake --build . -j $(nproc) --target tools
+        echo "::endgroup::"
+
+    - name: Install GCC problem matcher
+      uses: ammaraskar/gcc-problem-matcher@master
+
+    - name: Build
+      run: |
+        mkdir build
+        cd build
+
+        echo "::group::CMake"
+        emcmake cmake .. -DHOST_BINARY_DIR=../build-host
+        echo "::endgroup::"
+
+        echo "::group::Build"
+        echo "Running on $(nproc) cores"
+        cmake --build . -j $(nproc) --target openttd
+        echo "::endgroup::"