Single file publish support, test project and simple build CI

This also adds remote raspberry pi debugging with default install details. More testing is required as MonoMod may not be working for arm64 still

CI might not work yet either

.github/workflows/ci-otapi3.yml

@@ -0,0 +1,39 @@
+name: CI(OTAPI3)
+
+on: [push]
+
+jobs:
+  test:
+    runs-on: windows-latest
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - uses: actions/setup-dotnet@v1
+        with:
+          dotnet-version: '6.0.100'
+
+      - name: MonoMod dev build
+        run: dotnet nuget add source https://pkgs.dev.azure.com/MonoMod/MonoMod/_packaging/DevBuilds%40Local/nuget/v3/index.json -n DevBuilds@Local
+
+      - name: Run tests
+        run: dotnet test
+
+  build:
+    runs-on: windows-latest
+    strategy:
+      matrix:
+        arch: ["win-x64", "osx-x64", "linux-x64", "linux-arm64", "linux-arm"]
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - uses: actions/setup-dotnet@v1
+        with:
+          dotnet-version: '6.0.100'
+
+      - name: MonoMod dev build
+        run: dotnet nuget add source https://pkgs.dev.azure.com/MonoMod/MonoMod/_packaging/DevBuilds%40Local/nuget/v3/index.json -n DevBuilds@Local
+
+      - name: Produce build
+        run: dotnet publish -r ${{ matrix.mode }} -f net6.0 -c Release -p:PublishSingleFile=true --self-contained true