Style and docs pass for release

Remove V2I, V3I, V4I (and style changes)

Totally useless.

Add update tool, update docs

Tweak docs

Create ci.yml

Big style pass

Maybe fix CI on Windows

Report coverage errors

Fix a missing coverage case

Try setting up MSVC another way

Update readmes

Fix remaining use of the name UpdateTool

.github/workflows/ci.yml

@@ -0,0 +1,34 @@
+name: CI
+
+on:
+  push:
+    branches: [ "master" ]
+  pull_request:
+    branches: [ "master" ]
+
+jobs:
+  test:
+    name: Test on ${{ matrix.os }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-latest, windows-latest, macOS-latest]
+
+    steps:
+    - uses: actions/checkout@v3
+    - uses: TheMrMilchmann/setup-msvc-dev@v2
+      with:
+        arch: x64
+      if: matrix.os == 'windows-latest'
+    - name: Test (Windows, MSVC)
+      run: ./run_test_msvc.bat
+      working-directory: ./test
+      if: matrix.os == 'windows-latest'
+    - name: Test (Windows, clang)
+      run: ./run_test_clang.bat
+      working-directory: ./test
+      if: matrix.os == 'windows-latest'
+    - name: Test (${{ matrix.os }})
+      run: make all
+      working-directory: ./test
+      if: matrix.os != 'windows-latest'