impr: Optimize build times a bit

lib/libimhex/source/api/event_manager.cpp

@@ -21,4 +21,30 @@ namespace hex {
     }
 
 
+    bool EventManager::isAlreadyRegistered(void *token, impl::EventId id) {
+        if (getTokenStore().contains(token)) {
+            auto&& [begin, end] = getTokenStore().equal_range(token);
+
+            return std::any_of(begin, end, [&](auto &item) {
+                return item.second->first == id;
+            });
+        }
+
+        return false;
+    }
+
+    void EventManager::unsubscribe(void *token, impl::EventId id) {
+        auto &tokenStore = getTokenStore();
+        auto iter = std::find_if(tokenStore.begin(), tokenStore.end(), [&](auto &item) {
+            return item.first == token && item.second->first == id;
+        });
+
+        if (iter != tokenStore.end()) {
+            getEvents().erase(iter->second);
+            tokenStore.erase(iter);
+        }
+    }
+
+
+
 }