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/protocols/AlphaModifier.cpp

@@ -111,9 +111,8 @@ void CAlphaModifierProtocol::onGetSurface(CWpAlphaModifierV1* pMgr, uint32_t id,
         return;
     }
 
-    const auto RESOURCE =
-        m_mAlphaModifiers.emplace(surface, std::make_unique<CAlphaModifier>(std::make_shared<CWpAlphaModifierSurfaceV1>(pMgr->client(), pMgr->version(), id), surface))
-            .first->second.get();
+    const auto RESOURCE = m_mAlphaModifiers.emplace(surface, std::make_unique<CAlphaModifier>(makeShared<CWpAlphaModifierSurfaceV1>(pMgr->client(), pMgr->version(), id), surface))
+                              .first->second.get();
 
     if (!RESOURCE->good()) {
         pMgr->noMemory();