#200 switch new run to static atomic

[bracyw]

Changes

Implemented a global AtomicI32 to keep track of current run number.

Notes

Had to do a global Atomic because Atomics couldn't be passed through a post (doesn't have clone trait).

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Closes #200

[RChandler234]

pls verify that getCurrentRun/ add new run button works correctly in this PR. Right now it's not working on my local (I think bc of an empty db) and causes the UI to say it's disconnected from the backend