Setting a vertex along with an ROI about larcv HOT 6 CLOSED

Currently can draw vertex. Need to decide how to save that information into an ROI.

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Looks like @drinkingkazu has written storage class for 2D vertex: a22f14b. going to merge master with tmw_roi_feature and then utilize object to store hand-scanned vertex.

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Lauren found a bug. Occurs when loading ROIs from file.

Traceback (most recent call last):
  File "/Users/twongjirad/working/larbys/LArCV/mac/pyrgb/display/rgbdisplay.py", line 524, in plotData
    self.roitool_layout.reloadROI()
  File "/Users/twongjirad/working/larbys/LArCV/mac/pyrgb/display/roilayout.py", line 358, in reloadROI
    if not self.roisg.fix_vertex_to_bb:
AttributeError: 'ROIToolLayout' object has no attribute 'roisg'

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@twongjirad a clarification on 2D stuff in 2 categories:

Simple product for pixel location info
Pixel2D ... just pixel coordinate
Pixel2DCluster ... a set of such poop

Sophisticated product for geometrical calculation (algorithm to be ported from another geometrical computation package)
Vector2D ... double precision coordinate
LineSegment2D ... two Vector2D to define a finite line segment
AABox2D ... two Vector2D to define axis-aligned box

I think anything a user will do from GUI has no better precision than a pixel point, so Pixel2D should be enough.
If we want to store a value associated with each Pixel2D we can define something else (like Hit2D maybe... as something carrying time, wire, and value).

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I finished the save feature here. Will check into tmw_roi_feature soon.

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finished: d839117

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