Migrate to Tauri v2 (#664)

Closes #410

- Ran the automated migration tool:
https://v2.tauri.app/start/migrate/from-tauri-1/#automated-migration
- Made several code modifications to accommodate Tauri v2

I verified the application runs without errors by checking various
outputs.

.github/workflows/build.yml

@@ -29,7 +29,7 @@ jobs:
         # if: matrix.platform == 'ubuntu-20.04'
         run: |
           sudo apt-get update
-          sudo apt install -y libwebkit2gtk-4.0-dev libgtk-3-dev libayatana-appindicator3-dev librsvg2-dev
+          sudo apt install -y libwebkit2gtk-4.1-dev libxdo-dev libssl-dev libayatana-appindicator3-dev librsvg2-dev
       - name: Make Tauri build destination
         run: mkdir -p app/build
       - name: Build App

.github/workflows/test_app.yml

@@ -30,7 +30,7 @@ jobs:
         # if: matrix.platform == 'ubuntu-20.04'
         run: |
           sudo apt-get update
-          sudo apt install -y libwebkit2gtk-4.0-dev libgtk-3-dev libayatana-appindicator3-dev librsvg2-dev
+          sudo apt install -y libwebkit2gtk-4.1-dev libxdo-dev libssl-dev libayatana-appindicator3-dev librsvg2-dev
       - name: Install cargo-llvm-cov
         uses: taiki-e/install-action@cargo-llvm-cov
       - name: Make Tauri build destination