Some root cleanup

[larsgw]

To replace Travis we can use:

name: Java CI

on:
  push:
  pull_request:

jobs:
  build:

    runs-on: ubuntu-latest

    strategy:
      matrix:
        openjdk: [8, 11, 14]

    steps:
    - uses: actions/checkout@v3
    - name: Set up JDK
      uses: actions/setup-java@v3
      with:
        java-version: ${{ matrix.openjdk }}
        distribution: 'temurin'
    - name: Build with Ant
      run: ant exe

With a badge:

[egonw]

@larsgw, I think we can have different compile scenario's for different branches, right?

[larsgw]

Yes, maybe even just by changing the yml file in that branch.

[mkutmon]

so should we make more changes or can the pull request already be merged?

[egonw]

This can be merged.