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Previously the plot function plotted 1000 points in the spaces between each optic. This function
now plots onto a user-defined axis with arbitrary start and stop positions.

Known bug: if the trace is conducted to the last optic in a sequence, and an axis is defined with
positions beyond the last optic, the last optic does not influence the beam in positions beyond it.

Split TraceSolution into separate classes for simulations and utility traces.

See merge request !3

The previous solution code had many instances of if/else blocks checking the trace type.
Using subclasses to implement trace-type-specific logic seems to make more sense.

The latest version of networkx removed the attribute node from
all graph classes in favour of using the nodes attribute. All
accesses to this have been changed now in the finesse code to
reflect this.

This allows passing kwargs to `model.build` via `kat.run`, e.g. which
simulation type to use.

The plot method of ArraySolution can now produce animated plots of CCD image
data over the scanned xaxis parameter of a model. This feature will also
be extended to other arbitrary detectors to allow animated plots over a
specified axis when multiple parameters have been scanned.

Fixed a bug in CCD get_output where a reference to the output array was
being returned rather than a copy.

file to playground for debugging

in BaseSimulation.initialise (important for retrace off models)

Fixed an issue with beam tracing when unstable / critical cavities
are present

during knm computations and setting coupling matrix to
zeroes if true

This provides the equivalent of the `xaxis*` command in Finesse 2; the
returned xaxis points will differ from the actual value of the parameter
by `offset`.