ENH: basic Z-plot widget

[YektaY]

Description

A basic Z-plot widget.

The Z-plot widget is to plot data along a physical dimension of a facility (at SLAC the z-dimension of the accelerator) and provide a dynamic symbolic diagram of the facility corresponding to the given data points.

The idea here is that this basic Z-plot widget could serve as a base template z-plot widget. It provides a basic plotting widget, which could be used on it's own, but lacks more convenient methods for gathering data and corresponding symbols for the plot.

Question:

This is a draft PR because documentation is still being written at the moment. In the mean time I wanted to see if this would be something which would be a good fit for PyDM. If it is a good fit, are there any additional features or changes which could enhance this basic z-plot widget?

Motivation and Context

SLAC had a need for a z-plot to plot PVs along the accelerator. Offering up this stripped down version as a base z-plot widget in case other users of PyDM may have need for a similar widget.

How Has This Been Tested?

Tested on an example Gui.

Where Has This Been Documented?

documentation is still being worked on.

Screenshots:

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Codecov Report

❌ Patch coverage is 25.23364% with 80 lines in your changes missing coverage. Please review.
✅ Project coverage is 59.75%. Comparing base (275c26f) to head (cfd855c).
⚠️ Report is 1261 commits behind head on master.

Files with missing lines	Patch %	Lines
pydm/widgets/z_plot.py	23.80%	80 Missing ⚠️
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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #908      +/-   ##
==========================================
- Coverage   60.20%   59.75%   -0.46%     
==========================================
  Files         102      103       +1     
  Lines       12802    12999     +197     
==========================================
+ Hits         7707     7767      +60     
- Misses       5095     5232     +137     

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