cleanup: Remove support for EOL versions of Python

Fixes #905

.github/workflows/ci.yml

@@ -109,6 +109,7 @@ jobs:
         libeigen3-dev libfreetype6-dev libgl1-mesa-dev libjpeg-dev libode-dev
         libopenal-dev libpng-dev libssl-dev libvorbis-dev libx11-dev
         libxcursor-dev libxrandr-dev nvidia-cg-toolkit zlib1g-dev
+        python3-setuptools
 
         # Workaround for CMake 3.12 finding this first:
 
@@ -180,37 +181,6 @@ jobs:
       run: cmake --build . --config ${{ matrix.config }} --parallel 4
       # END A
 
-    - name: Setup Python (Python 2.7)
-      if: contains(matrix.python, 'YES')
-      uses: actions/setup-python@v1
-      with:
-        python-version: 2.7
-    - name: Configure (Python 2.7)
-      if: contains(matrix.python, 'YES')
-      working-directory: build
-      shell: bash
-      run: >
-        cmake -DWANT_PYTHON_VERSION=2.7
-        -DPython_FIND_REGISTRY=NEVER -DPython_ROOT=$pythonLocation .
-    - name: Build (Python 2.7)
-      if: contains(matrix.python, 'YES')
-      # BEGIN A
-      working-directory: build
-      run: cmake --build . --config ${{ matrix.config }} --parallel 4
-      # END A
-    - name: Test (Python 2.7)
-      # BEGIN B
-      if: contains(matrix.python, 'YES')
-      working-directory: build
-      shell: bash
-      env:
-        PYTHONPATH: ${{ matrix.config }}
-      run: |
-        PYTHON_EXECUTABLE=$(grep 'Python_EXECUTABLE:' CMakeCache.txt | sed 's/.*=//')
-        $PYTHON_EXECUTABLE -m pip install pytest
-        $PYTHON_EXECUTABLE -m pytest ../tests
-      # END B
-
     - name: Setup Python (Python 3.5)
       if: contains(matrix.python, 'YES')
       uses: actions/setup-python@v1
@@ -407,18 +377,6 @@ jobs:
       run: |
         python -m pip install pytest
         PYTHONPATH=built LD_LIBRARY_PATH=built/lib DYLD_LIBRARY_PATH=built/lib python -m pytest
-    - name: Set up Python 2.7
-      uses: actions/setup-python@v1
-      with:
-        python-version: 2.7
-    - name: Build Python 2.7
-      run: |
-        python makepanda/makepanda.py --no-copy-python --git-commit=${{github.sha}} --outputdir=built --everything --no-eigen --python-incdir=$pythonLocation/include --python-libdir=$pythonLocation/lib --verbose --threads=4
-    - name: Test Python 2.7
-      shell: bash
-      run: |
-        python -m pip install pytest
-        PYTHONPATH=built LD_LIBRARY_PATH=built/lib DYLD_LIBRARY_PATH=built/lib python -m pytest
     - name: Make installer
       run: |
         python makepanda/makepackage.py --verbose --lzma