Added booleans for thread workers to look at when running

pause_work temporarily stops work, but should keep the thread alive.

stop_work should kill the thread.

src/state.hpp

@@ -21,6 +21,7 @@ namespace cw::state
     cw::node::NodeAllocator allocator;
     std::queue<u64> queue;
 
+    bool pause_work, stop_work;
     std::mutex mutex_queue;
     std::mutex mutex_allocator;