Switch CI from CirlceCI to Github Actions

With accordance to company policies.

Appveyor file is deleted as well as it is even older CI engine and
dlisio is build on newer Windows.

All cache-related steps are removed as on github actions builds run in
reasonable times anyway.

.github/actions/cmake_build/action.yml

@@ -0,0 +1,44 @@
+name: Build with cmake
+description: Common steps for library build/test/install using cmake
+inputs:
+  type:
+    description: CMAKE_BUILD_TYPE (Release, Debug, etc)
+    required: false
+    default: Release
+  scan:
+    description: Cmake command prefix
+    required: false
+    default: ''
+  cmakeflags:
+    description: CMAKE_CXX_FLAGS
+    required: false
+    default: ''
+  cxxflags:
+    description: CXX_FLAGS
+    required: false
+    default: ''
+runs:
+  using: composite
+  steps:
+  - name: Configure
+    run: |-
+      mkdir build
+      cd build
+      ${{ inputs.scan }} \
+      cmake -DBUILD_SHARED_LIBS=ON \
+            -DCMAKE_EXPORT_COMPILE_COMMANDS=ON \
+            -DCMAKE_BUILD_TYPE=${{ inputs.type }} \
+            -DCMAKE_CXX_FLAGS=${{ inputs.cxxflags }} \
+            ${{ inputs.cmakeflags }} \
+            ..
+    shell: bash
+
+  - name: Build and install
+    run: "${{ inputs.scan }} cmake --build build --target install"
+    shell: bash
+
+  - name: Test
+    run: |-
+      cd build
+      ctest --verbose
+    shell: bash