[zeditor] Map Copypasta Memory Leak

[Asuna Yuuki Nagato]

Steps to recreate:


File->New
Press Ctrl+Shift+ESC to bring up Task Manager
Highlight zeditor.exe and view memory usage
Select combo #12
Ctrl+Click the screen; Observe entire screen turns from captain blue to tan
Edit->Copy
Do the following many times:

Edit->Adv. Paste->Paste To All
Click 'Yes' to paste to all screens on the current map
Edit->Maps->Delete Map
Click 'Yes' to clear this entire map

Observe memory usage of zeditor.exe has trended upwards

[Asuna Yuuki Nagato]

onPasteToAll() is in zquest.cpp

[Asuna Yuuki Nagato]

File->New appears to clear the undo/redo stack.