Updated efsw.

Updated github actions build files.
eterm: Windows fixes. Some refactor.

.github/workflows/eepp-linux-build-check.yml

@@ -7,10 +7,9 @@ jobs:
     runs-on: ubuntu-18.04
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v2
+      uses: actions/checkout@v3
       with:
         fetch-depth: 2
-        ref: develop  
     - name: Checkout submodules
       run: |
         git submodule update --init --recursive