Declarative plugin management (#2180)

* Declarative plugin management

Allow declaring `plugin` entries in the hyprland configuration.

Plugins will be loaded if an entry is added and unloaded if that entry
is removed.

* Replace pointers with copying in updateconfigPlugins

* Include which plugin was declared twice in error

src/hyprerror/HyprError.cpp

@@ -33,7 +33,6 @@ void CHyprError::queueCreate(std::string message, const CColor& color) {
 
 void CHyprError::createQueued() {
     if (m_bIsCreated) {
-        m_bQueuedDestroy = false;
         m_tTexture.destroyTexture();
     }
 
@@ -171,4 +170,6 @@ void CHyprError::draw() {
 void CHyprError::destroy() {
     if (m_bIsCreated)
         m_bQueuedDestroy = true;
+    else
+        m_szQueued = "";
 }