Add feature flags for scenarios

Author: juntyr

.vscode/settings.json

@@ -5,9 +5,8 @@
     "rust-analyzer.checkOnSave.command": "reap-clippy",
     "rust-analyzer.cargo.allFeatures": false,
     "rust-analyzer.cargo.features": [
-        "rustcoalescence-algorithms-gillespie",
-        "rustcoalescence-algorithms-independent",
-        "rustcoalescence-algorithms-cuda",
-        "necsim-partitioning-mpi"
+        "all-algorithms",
+        "all-scenarios",
+        "mpi-partitioning"
     ],
 }