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/input/IdleInhibitor.cpp

@@ -5,11 +5,11 @@
 
 void CInputManager::newIdleInhibitor(std::any inhibitor) {
     const auto PINHIBIT = m_vIdleInhibitors.emplace_back(std::make_unique<SIdleInhibitor>()).get();
-    PINHIBIT->inhibitor = std::any_cast<std::shared_ptr<CIdleInhibitor>>(inhibitor);
+    PINHIBIT->inhibitor = std::any_cast<SP<CIdleInhibitor>>(inhibitor);
 
     Debug::log(LOG, "New idle inhibitor registered for surface {:x}", (uintptr_t)PINHIBIT->inhibitor->surface);
 
-    PINHIBIT->inhibitor->listeners.destroy = PINHIBIT->inhibitor->resource.lock()->events.destroy.registerListener([this, PINHIBIT](std::any data) {
+    PINHIBIT->inhibitor->listeners.destroy = PINHIBIT->inhibitor->resource->events.destroy.registerListener([this, PINHIBIT](std::any data) {
         std::erase_if(m_vIdleInhibitors, [PINHIBIT](const auto& other) { return other.get() == PINHIBIT; });
         recheckIdleInhibitorStatus();
     });