Changes:
- MemoryWindow was cleaned up and gives more feedback on searches.
Some bugs were fixed as well:
- A complex bug that allowed tearing off tabs and opening multiple
copies of a debug panel which lead to segfaults
- Another segfault related to right-click menus on code/memory views
when those tools were floating in their own window.
Incrementing the reference count here isn't necessary, as they construct with a count of 1. Incrementing again results in the attributes not being freed.
This technically also fixes a memory leak in WatchView.cpp, because the table setting was done such that the grid wouldn't take ownership of the table, which means said table wouldn't be deleted in the grid's destructor.
Minor other alterations that relate to above as well.
Also added the PanicAlertT version of alerts for some error messages that
use PanicAlert. We want the user to actually understand why the error
occurred.
