redo plotter with SVG as github build dependencies don't like plotter bitmap backend

Author: basvanwesting

.github/workflows/rust.yml

@@ -16,10 +16,6 @@ jobs:
 
     steps:
     - uses: actions/checkout@v4
-    - name: Install dependencies
-      run: |
-        sudo apt-get update
-        sudo apt-get install -y libfontconfig1-dev
     - name: Build
       run: cargo build --verbose
     - name: Run tests