Fix test failures

a. `DeprecationWarning: The 'warn' method is deprecated, use 'warning' instead`
Updated call in `bumble/smp.py`

b. `ModuleNotFoundError: No module named 'bumble.apps'`
Updated imports in `tests/import_test.py`

c. Added `pytest-html` for easier viewing of test results
Added package in `setup.cfg`, and hook in `tasks.py`

d. Updated workflows to use `invoke test`

This is a partial fix of #81

.github/workflows/python-build-test.yml

@@ -21,7 +21,7 @@ jobs:
     - name: Get history and tags for SCM versioning to work
       run: |
         git fetch --prune --unshallow
-        git fetch --depth=1 origin +refs/tags/*:refs/tags/*      
+        git fetch --depth=1 origin +refs/tags/*:refs/tags/*
     - name: Set up Python 3.10
       uses: actions/setup-python@v3
       with:
@@ -30,9 +30,9 @@ jobs:
       run: |
         python -m pip install --upgrade pip
         python -m pip install ".[build,test,development,documentation]"
-    - name: Test with pytest
+    - name: Test
       run: |
-        pytest
+        invoke test
     - name: Build
       run: |
         inv build