Remove libolm usage & switch to poetry (#65)

This PR does a couple of things. 
- convert to using poetry to make rust integration easier
- switch over to using vodozemac for crypto
- switch over to matrix-sdk-crypto to remove mautrix dependency (which
was pulling in libolm)

After this, libolm is no longer used and it has been removed from the CI
workflow to be sure.
All functionality remains compatible with previous version of the
matrix-content-scanner.

.dockerignore

@@ -6,5 +6,10 @@
 !README.md
 !pyproject.toml
 !setup.cfg
+!poetry.lock
+!Cargo.toml
+!Cargo.lock
+!build_rust.py
+!rust
 
 **/__pycache__

.github/workflows/ci.yml

@@ -9,24 +9,28 @@ jobs:
     name: Check code style
     runs-on: ubuntu-latest
     steps:
-      - run: sudo apt-get install -y libolm-dev libmagic1
-      - uses: actions/checkout@v2
+      - run: sudo apt-get install -y libmagic1
+      - uses: actions/checkout@v4
+      - name: Install Rust
+        uses: dtolnay/rust-toolchain@stable
       - uses: actions/setup-python@v2
         with:
           python-version: "3.11"
-      - run: python -m pip install tox
+      - run: python -m pip install tox "poetry==1.8.3"
       - run: tox -e check_codestyle
 
   check-types:
     name: Check types with Mypy
     runs-on: ubuntu-latest
     steps:
-      - run: sudo apt-get install -y libolm-dev libmagic1
-      - uses: actions/checkout@v2
+      - run: sudo apt-get install -y libmagic1
+      - uses: actions/checkout@v4
+      - name: Install Rust
+        uses: dtolnay/rust-toolchain@stable
       - uses: actions/setup-python@v2
         with:
           python-version: "3.11"
-      - run: python -m pip install tox
+      - run: python -m pip install tox "poetry==1.8.3"
       - run: tox -e check_types
 
   unit-tests:
@@ -36,13 +40,14 @@ jobs:
       matrix:
         # Run the unit tests both against our oldest supported Python version
         # and the newest stable.
-        python_version: [ "3.8", "3.11" ]
+        python_version: [ "3.10", "3.12" ]
     steps:
-      - run: sudo apt-get install -y libolm-dev libmagic1
-      - uses: actions/checkout@v2
+      - run: sudo apt-get install -y libmagic1
+      - uses: actions/checkout@v4
+      - name: Install Rust
+        uses: dtolnay/rust-toolchain@stable
       - uses: actions/setup-python@v2
         with:
           python-version: ${{ matrix.python_version }}
-      - run: python -m pip install tox
+      - run: python -m pip install tox "poetry==1.8.3"
       - run: tox -e py
-

.gitignore

@@ -10,4 +10,11 @@ config.yaml
 /build
 /.vscode
 mcs_pickle.txt
-pickle
+pickle
+
+# Poetry will create a setup.py, which we don't want to include.
+/setup.py
+
+# rust
+/target/
+/src/matrix_content_scanner/*.so