Improve protocol format

[kernfel]

Having encountered a very large protocol file recently (180k lines, mostly due to SpikeGenerator data), I noticed:

1. Loading, and thus startup, is very slow under such circumstances
2. The protocol format is extremely redundant and would likely benefit from a better (read: standard & tree-based, e.g. yaml) format both in human readability and loading speed
3. SpikeGenerator data should perhaps live in a separate file... or at least on the horizontal axis rather than the vertical one, to ease scrolling to relevant sections if offline troubleshooting is required.