Colormap removal API

[ToppDev]

Hello,

I would like to request a feature for colormap handling.

Problem to solve

Currently it is possible to add colormaps via AddColormap(...), but it is not possible to remove them.

Proposal

Add two new functions into the API

void RemoveColormap(const char* name);

void RemoveColormap(ImPlotColormap colormap);

Further details

The style editor could also be expanded to showcase this functionality.

[epezent]

I think this is fine to add. We have to decide weather or not to allow removing built in color maps. My inclination is that it should be an error and cause an assert.

Would you consider submitting a PR for this feature?

[ToppDev]

Throwing an error for the built in color maps sounds fine to me.

I will give it a try this weekend and make a pull request if ready.

[ToppDev]

I implemented it, see #344 . I am actually unfamiliar with Discussions on GitHub. Should I consider making this into an issue now?