Show loading and disable button while running scripts

[secondl1ght]

Thanks for the site, I use it often. One thing to note, I just tried to make a donation and when I click on the button it appears as if nothing happens because there is no visual UI state change when you click the button. The button should do something when you click it to indicate that something is happening and it also should be disabled while the scripts are running to avoid multiple submits. I clicked it multiple times because I wasn't sure and then the BTC pay server windows appeared after a long delay. Also the cursor is set to default on hover but it should be set to pointer.