#2079: Disable submit buttons and adds error notification

[h-tong]

Steps to Test #2079

1. Create a scorable piece of individual, experimental, or case-control evidence in a GDM
2. From the main gene-disease record page, click "View/Score" on your created piece of evidence
3. Add a score and click "Save"
4. Expect to see the "Save" button to disable and display a busy animation.

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Steps to Test Error Notification

1. Repeat steps 1 and 2 above.
2. Go to your network tab in the Chrome dev tools and set the throttling from "Online" to "Offline" (to simulate an error occurring)
3. Add a score and click "Save"
4. Expect to see a red notification message show up in the top right corner of the page.

[markmandell]

Looks good! 👍 Tested all functionality and ran through our automated tests. Really like the addition of the notifications as well!

[shaungc-su]

Nice catch on the type button to submit for submitBusy! The error notification component looks handy, would be useful for other feature as well.