Stateful Button

[Oipo]

Currently, when a user clicks on a button, the button gets disabled and is supposed to only be re-enabled once the asynchronous callback to IdleLands is completed.

But it happens a lot that when other asynchronous callbacks are completed, the GUI gets updated to reflect e.g. a new action, thus enabling the button before the intended callback is complete.

This should be fixed by keeping track of intended and non-intended callbacks trying to update the gui, through a derived class of Windows.Forms.Button