internal: new shared_ptr and weak_ptr implementation (#5883)

moves std::shared_ptrs to a new implementation

Advantages:
- you can dereference a weak_ptr directly. This will obviously segfault on a nullptr deref if it's expired.
   - this is useful to avoid the .lock() hell where we are 100% sure the pointer _should_ be valid. (and if it isn't, it should throw.)
- weak_ptrs are still valid while the SP is being destroyed.
   - reasoning: while an object (e.g. CWindow) is being destroyed, its `weak_ptr self` should be accessible (the sp is still alive, and so is CWindow), but it's not because by stl it's already expired (to prevent resurrection)
   - this impl solves it differently. w_p is expired, but can still be dereferenced and used. Creating `s_p`s is not possible anymore, though.
   - this is useful in destructors and callbacks.

src/managers/eventLoop/EventLoopManager.hpp

@@ -2,7 +2,6 @@
 
 #include <condition_variable>
 #include <mutex>
-#include <memory>
 #include <thread>
 #include <wayland-server.h>
 
@@ -13,8 +12,8 @@ class CEventLoopManager {
     CEventLoopManager();
 
     void enterLoop(wl_display* display, wl_event_loop* wlEventLoop);
-    void addTimer(std::shared_ptr<CEventLoopTimer> timer);
-    void removeTimer(std::shared_ptr<CEventLoopTimer> timer);
+    void addTimer(SP<CEventLoopTimer> timer);
+    void removeTimer(SP<CEventLoopTimer> timer);
 
     void onTimerFire();
 
@@ -28,8 +27,8 @@ class CEventLoopManager {
     } m_sWayland;
 
     struct {
-        std::vector<std::shared_ptr<CEventLoopTimer>> timers;
-        int                                           timerfd = -1;
+        std::vector<SP<CEventLoopTimer>> timers;
+        int                              timerfd = -1;
     } m_sTimers;
 };