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/InputMethodRelay.cpp

@@ -85,7 +85,7 @@ CTextInput* CInputMethodRelay::getFocusedTextInput() {
 }
 
 void CInputMethodRelay::onNewTextInput(std::any tiv3) {
-    m_vTextInputs.emplace_back(std::make_unique<CTextInput>(std::any_cast<std::weak_ptr<CTextInputV3>>(tiv3)));
+    m_vTextInputs.emplace_back(std::make_unique<CTextInput>(std::any_cast<WP<CTextInputV3>>(tiv3)));
 }
 
 void CInputMethodRelay::onNewTextInput(STextInputV1* pTIV1) {
@@ -106,7 +106,7 @@ void CInputMethodRelay::activateIME(CTextInput* pInput) {
     if (m_pIME.expired())
         return;
 
-    m_pIME.lock()->activate();
+    m_pIME->activate();
     commitIMEState(pInput);
 }
 
@@ -114,7 +114,7 @@ void CInputMethodRelay::deactivateIME(CTextInput* pInput) {
     if (m_pIME.expired())
         return;
 
-    m_pIME.lock()->deactivate();
+    m_pIME->deactivate();
     commitIMEState(pInput);
 }