Disable export button in UI while exporting

[lucasdinonolte]

A tiny quality of life change to the UI.

• The Export and Generate buttons are disabled while an export is running to more clearly communicate to the user that something is happening
• This is done by allowing the UI to subscribe to events from the mechanic runtime
• This could thus easily be extended to emit events on every frame to present the user with a growing number or progress bar while exporting

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