Separate RNG library (#470)

* seperates the RNG library

* fixes crypto tests

* adds rng256 workflow

* fixes formatting

.github/workflows/rng256_test.yml

@@ -0,0 +1,39 @@
+---
+name: RNG library tests
+on:
+  push:
+    paths:
+      - 'libraries/rng256/**'
+  pull_request:
+    types: [opened, synchronize, reopened]
+    paths:
+      - 'libraries/rng256/**'
+
+jobs:
+  rng256_test:
+    runs-on: ubuntu-18.04
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          submodules: "true"
+      - name: Install Rust toolchain
+        run: rustup show
+      - uses: actions/setup-python@v1
+        with:
+          python-version: 3.7
+      - name: Install Python dependencies
+        run: python -m pip install --upgrade pip setuptools wheel
+      - name: Set up OpenSK
+        run: ./setup.sh
+
+      - name: Unit testing of rng256library (release mode)
+        uses: actions-rs/cargo@v1
+        with:
+          command: test
+          args: --manifest-path libraries/rng256/Cargo.toml --release --features std
+
+      - name: Unit testing of rng256 library (debug mode)
+        uses: actions-rs/cargo@v1
+        with:
+          command: test
+          args: --manifest-path libraries/rng256/Cargo.toml --features std