Change type of checking whether window have on drop possibility.
Reason:
Previously this parameter was checking by class name, so it blocking creating similar objects to miniwindow or inheritance from miniwindow object without changing sources. So it block creating modules with new UI objects working with miniwindowcontainer.
* Fixed the "options" module hotkey (changed boost walker to Ctrl+Shift+D).
* Fixed a small issue with UIMiniWindow:setup() function (was setting parent before its pos).
* Pic signature has changed for cipsoft client.
* Fixed 'client type' byte position in the login packet.
* Changed the ping function to execute every 4 seconds rather than 2.
* Changed some protocolgame for pv973 support.
* Fix to market constraints.
* Fixed bug with skill percent not rounding.
* Dereference textEdit variable properly.
* Fix to the outfit window regarding mounts.
* Added enableResize to UIMiniWindow.
* Some minor edits.
