Multiclip v3.1.0.52

Because of Tanki Online update 285, now this program can have only one
hotkey for every command.
Now hotkeys display in top-right corner of row.
TCommandList is heritor of TObjectList, for this TCommand was converted
to class.
MainForm handle was moved to the highest level of unit uCommandList.
Now search of last active window occurs every second.
Scan-codes was removed from keybd_events.
WM_HOTKEY was simplified.