Rename Slave to Host

The role of a slave as a host for Factorio servers is not well reflected
in its name and has caused confusion among users.  Rename slave to host
to better reflect its role as a host of Factorio servers.

.github/workflows/node.js.yml

@@ -26,7 +26,7 @@ jobs:
         node-version: ${{ matrix.node-version }}
     - run: pnpm i --no-optional --no-frozen-lockfile
     - run: wget -q -O factorio.tar.gz https://www.factorio.com/get-download/latest/headless/linux64 && tar -xf factorio.tar.gz && rm factorio.tar.gz
-    - run: node packages/lib/build_mod --source-dir packages/slave/lua/clusterio_lib --output-dir temp/test/mods
+    - run: node packages/lib/build_mod --source-dir packages/host/lua/clusterio_lib --output-dir temp/test/mods
     - run: wget -q -O temp/test/mods/subspace_storage_1.99.8.zip -L https://github.com/clusterio/subspace_storage/releases/download/1.99.6/subspace_storage_1.99.8.zip
     - name: Run tests
       if: ${{ matrix.node-version != '12.x' }}