core: fix data race and a unsigned int rollover (#7278)

* keybindmgr: avoid uint rollover on mouse keycode

mouse keycode is 0, and the switch case checks for 0 - 8 and rolls over,
just return early if keycode is 0.

* watchdog: avoid data races in watchdog

asan thread sanitizer reported data races in the watchdog from reading
and setting the bool variables make them std::atomic bools. also add a
atomic bool for the main thread to wait for to avoid data race when
reading the config values.

* hyprdebug: change non unicode character to name

asan created false positives and didnt like this bit, so for the sake of
easier debugging rename it to something unicode.

src/Compositor.cpp

@@ -552,6 +552,10 @@ void CCompositor::initManagers(eManagersInitStage stage) {
 
             g_pConfigManager->init();
             g_pWatchdog = std::make_unique<CWatchdog>(); // requires config
+            // wait for watchdog to initialize to not hit data races in reading config values.
+            while (!g_pWatchdog->m_bWatchdogInitialized) {
+                std::this_thread::yield();
+            }
 
             Debug::log(LOG, "Creating the PointerManager!");
             g_pPointerManager = std::make_unique<CPointerManager>();