Allow x and z manual movement

[micahwoodard]

Allows x and z movements within session. Y movement will still be reset. Also adds final stage position.

Partially addressing concerns in #170 and #142

[alexpiet]

To clarify the behavior:

• manual movements in X and Z are preserved (not reset)
• the anti-bias algorithm works relative to the initial position in X + any manual movements
• Movements in Y are reset at the start of the next trial
• If a user decides the Y position is poor, either too close or too far from the mouse, then they would need to stop the session to modify the position.

[alexpiet]

Does the PR additional start the session using the final position from the previous session? Or simply just record the final position? Its hard to read the bonsai code changes on github

[bruno-f-cruz]

I dont think we can implement the logic like this (also the reason why I did not want to implement it in the first place :P).

I still think it is super dangerous to allow people to save a new position mid-session. What if someone closes the session while the spout is retracted? What if the spout is midway through travel? Too many edge cases. If you want to do this, you gotta figure out a way to log the position of the spout during a period where NO manual intervention is allowed, and you are absolutely sure the spout is in the extended position.

[alexpiet]

The current behavior allows the movement, but then (inconsistently) resets it.

I think we either need to not allow any manual movement at all, even temporarily, or allow movement in X and Z.

[micahwoodard]

Does the PR additional start the session using the final position from the previous session? Or simply just record the final position? Its hard to read the bonsai code changes on github

It logs the final position but pushing for next session will be handled by micestro in a separate pr