Add support for multiple turbine types in calculate_horizontal_plane_with_turbines()

[scottryn]

Add support for multiple turbine types in calculate_horizontal_plane_with_turbines()

Function now copies turbine type list from input FlorisInterface and appends a nrel_5MW to ensure correct number of turbines in fi.reinitialize() calls.

Related issue

No related open issues.

Impacted areas of the software

floris.tools.visualization.py

Additional supporting information

Small modification to prevent turbine_type must have the same number of entries as layout_x/layout_y or have a single turbine_type value error when generating a CutPlane using calculate_horizontal_plane_with_turbines() with multiple turbine definitions. Previously the test turbine was left undefined leading to a potential mismatch between the layout arguments and number of turbines if turbine_type was specified in earlier reinitializations.

Test results, if applicable

[rafmudaf]

I've assigned myself to handle this pull request, but @paulf81 since you wrote this function could you review it first?

[paulf81]

Approved, reviewed the code changes and this is a good solution to the issue

[paulf81]

Actually hold on, let me debug the example

[paulf81]

@rafmudaf I pushed a small change that I think fixes the issue that was causing example 02 to fail. In a nutshell, the turbine type array in that case is length 1, which farm.py knows to expand to n_turbines using:
_turbine_types *= self.n_turbines (line 201)

I added a similar catch/logic here

[paulf81]

All tests/examples passing now so approving