External trigger

[TeraMika]

This is a big branch with a number of changes focusing around the external triggering device, and adjustments to how most other adapters behave.

Issues Approached

Closes #16. It feels inarguable that, while some other minor refinements may need to be done, the camera controls are integrated. Closes #12. With no talk of the performance monitor, we can safely put that aside for now.
Closes #14. What further hardware is wanted can be discussed in future. For the purposes of the integration, this concludes it with finishing the camera work.
References #3. As with #19.

Changes Made

Too many to talk about in much detail.
+ Acquisition adapter now exists, using munir to handle acquisitions via odin data and inter-adapter-communication to link other adapters together.
+ Added external trigger and all of the relevant sourcefiles associated there. Uses same modbus mechanism as the furnace/PID PLC
~ Trigger means that there are now two platformio projects, so the existing 'livex' one has been moved up into the firmware directory
+ Image compression handling in the live_data adapter
~ liveXEndPoint in the UI becomes furnaceEndPoint as the acquisition adapter steals the livex title
~ UI tabs/pages altered. 'Metadata and Setup' is one page merging those two concepts. #19 integrates the metadata half of this.
~ camera adapter structure reworked: now tree uses camera names to define paths, instead of an array. This matches how munir handles multiple subsystems