Need Optional parameter for Keypoint class as we have one for BoundingBox

In case, we want to track the Keypoint transformations and pickout the labels which we want to use, It would be useful if we add label parameter.

As of now, we can do something like the below code in BB's :
`ia.BoundingBox(
x

If the valueField parameter is not set in the config, the documentation specifies that valueField parameter should fall back to 'value'. However, the values are at some point through the plugin. I have created a fix so will make a pull request shortly.

points:
12 123
52 12
321 94
87 483
60 10
90 470

use command command:
500 500 10 < points.txt > heatmap.png
it create an empty png file. i open this file in photoshop, it report an error:
file parse mode can not parse this file.

I was poking around the codebase to see if there was any guidance on how to respond to plotly hover, click, etc. events when using iheatmapr with shiny.

I landed on the ?iheatmapr_event man page, which alludes to having an exemplar shiny app in its Examples section:

## Not run: 
shiny::runApp(system.file("examples", "shiny_example", package = "iheatmapr"))
## End(Not run)

I'm trying to scale the height of each rectangle plotted in a timeline according to a score value from 1-100.
Any method to control the height of plotted rectangles in svg?

I want to have a heatmap as a layer of my map so first I started checking the example but I could not put it to run. First, it miss some variables and imports but that is easy to solve but then the map never shows up. Wondering how to fix it!

The code from the readme.md is this one:

import React from 'react';
import { render } from 'react-dom';
import { Map, Marker, Popup, TileLayer }