Add cmake build workflow to try it out.

Author: Possseidon

.github/workflows/run-build-and-tests.yml

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+# Taken and modified from here:
+# https://github.com/lukka/CppBuildTasks-Validation/blob/master/.github/workflows/hosted-pure-workflow.yml
+
+name: Run build and tests
+
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+    branches:
+      - master
+
+jobs:
+  job:
+    name: ${{matrix.os}}
+    runs-on: ${{matrix.os}}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest, windows-latest]
+        include:
+          - os: windows-latest
+            triplet: x64-windows
+          - os: ubuntu-latest
+            triplet: x64-linux
+
+    env:
+      CMAKE_BUILD_DIR: ${{github.workspace}}/build/
+      VCPKG_ROOT: ${{github.workspace}}/vcpkg
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v2
+        with:
+          submodules: recursive
+
+      - name: Install CMake and Ninja
+        uses: lukka/get-cmake@latest
+
+      - name: Restore vcpkg and its artifacts
+        uses: actions/cache@v2
+        with:
+          # The first path is where vcpkg generates artifacts while consuming the vcpkg.json manifest file.
+          # The second path is the location of vcpkg (it contains the vcpkg executable and data files).
+          # The other paths starting with '!' are exclusions: they contain temporary files generated during the build of the installed packages.
+          path: |
+            ${{env.CMAKE_BUILD_DIR}}/vcpkg_installed/
+            ${{env.VCPKG_ROOT}}
+            !${{env.VCPKG_ROOT}}/buildtrees
+            !${{env.VCPKG_ROOT}}/packages
+            !${{env.VCPKG_ROOT}}/downloads
+          # The key is composed in a way that it gets properly invalidated: this must happen whenever vcpkg's Git commit id changes, or the list of packages changes.
+          # In this case a cache miss must happen and a new entry with a new key with be pushed to GitHub the cache service.
+          # The key includes: hash of the vcpkg.json file, the hash of the vcpkg Git commit id, and the used vcpkg's triplet.
+          # The vcpkg's commit id would suffice, but computing an hash out it does not harm.
+          # Note: given a key, the cache content is immutable.
+          # If a cache entry has been created improperly, in order the recreate the right content the key must be changed as well, and it must be brand new (i.e. not existing already).
+          key: |
+            ${{hashFiles('vcpkg.json')}}-${{hashFiles('.git/modules/vcpkg/HEAD')}}-${{matrix.triplet}}-invalidate
+
+      - name: (Linux) Install required tools for glfw
+        if: runner.os == 'Linux'
+        run: sudo apt-get install libxinerama-dev libxcursor-dev xorg-dev libglu1-mesa-dev
+
+      - name: (Windows) Ensure the Developer Command Prompt is setup correctly
+        if: runner.os == 'Windows'
+        uses: ilammy/msvc-dev-cmd@v1
+
+      - name: Install dependencies and generate project files
+        run: cmake -S "${{github.workspace}}" -B "${{env.CMAKE_BUILD_DIR}}" -GNinja -DCMAKE_TOOLCHAIN_FILE="${{env.VCPKG_ROOT}}/scripts/buildsystems/vcpkg.cmake"
+
+      - name: Build all
+        run: cmake --build "${{env.CMAKE_BUILD_DIR}}"
+
+      - name: Build dmath
+        run: cmake --build "${{env.CMAKE_BUILD_DIR}}" --target dmath
+
+      - name: Run tests
+        run: |
+          cd "${{env.CMAKE_BUILD_DIR}}"
+          ctest

.gitmodules

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+[submodule "vcpkg"]
+	path = vcpkg
+	url = https://github.com/microsoft/vcpkg.git