Add support for enumeration labnotebook entries and enhance visualisation for them

[t-b]

Some values like clamp mode are stored as numerical values but it would be nice to have human readable names instead of numbers shown as axis ticks.

• Add fourth row in numerical and textual keys wave
• Fill with JSON formatted mapping between values and human readable names
• Add support in databrowser settings history graph for using these human readable names instead of numbers using custom tick labels

Before this is tackled we need to think about storing the enum values in the LBN description wave vs storing it in code.