Plugin System (#1590)

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Co-authored-by: Mihai Fufezan <fufexan@protonmail.com>

src/managers/KeybindManager.hpp

@@ -8,6 +8,7 @@
 
 class CInputManager;
 class CConfigManager;
+class CPluginSystem;
 
 struct SKeybind {
     std::string key     = "";