Factor out all sub-forms into their own React components

[hoechenberger]

Already made some progress in #57, #60, but the following forms still need work

• reference move
• fill
• empty
• bubble cycle
• rinse
• (potentially the Connect / Disconnect button together with the configuration selection bits)

These were all skipped / postponed so far because they use modals, whose state (opened / closed) is handled globally via PumpForm's state.modal. These states should probably be moved into their respective new (factored-out) components directly.

The goal is to break the huge project down into smaller bits that are easier to maintain.