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.
* remove unnecessary include
* cmake: use pkg_get_variable
We can find wayland-scanner executable and wayland-protocols dir by
taking advantage of this function, so no need to use find_program or
manually call pkgconf executable.
* cmake: remove explicit rdynamic option
CMAKE_ENABLE_EXPORTS=ON already implies rdynamic so it's redundant to
set the latter explicitly.
Also, CMAKE_ENABLE_EXPORTS is superseded by
CMAKE_EXECUTABLE_ENABLE_EXPORTS in cmake 3.27.
* cmake: make xcb-errors dep optional
xcb-errors is being used in wlroots, where it's optional. So make it
optional in hyprland as well
