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.
By default enabled, will track the initial opened workspace of a window spawned for 2 minutes or until it's moved to a different workspace.
For example: you run a launcher and open an app on workspace 1, but quickly switch to workspace 2. The app will now open on workspace 1 regardless of your switch.
* workspace: update windows when group updates
* workspace: update windows when floating toggle
* workspace: update windows when stop dragging window by mouse
