#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

[jr1221]

Please just test changing run in client still works. You can do this by pointing client to scylla, and then incrementing the run in the client and see if it works.

[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

[jr1221]

one thing

[jr1221]

lgtm