core: free more memory on destruction (#6348)

* pointermgr: add destructor to state and free buf

if the pointer has a buffer set it wont be freed upon destruction, make
asan more happy by adding a destructor and wlr_buf_unlock it on exit.

* cursormgr: free the animation timer event source

properly free the animation timer event source on destruction.

* compositor: free the critsig event source on exit

properly free the critical signal event source on exit.

* popup: clang format style

clang format.

src/desktop/Popup.cpp

@@ -136,7 +136,7 @@ void CPopup::onCommit(bool ignoreSiblings) {
         onDestroy();
         return;
     }
-    
+
     if (m_pResource->surface->initialCommit) {
         m_pResource->surface->scheduleConfigure();
         return;