Heatmap Demo about imgui_bundle

[pthom]

Update: I merged the PR. thanks!

[pthom]

Hi,

Many thanks for this!

Those two functions were excluded by the generator because their signature is too convoluted: see where they were excluded in the generator options

So, I had to add these bindings manually, by adapting the code you provided.

See work in progress in this related PR

FYI, I had to do some adaptations, here is a summary:

e2d69aa demo_heatmap python / use dpi independent sizing
0002a33: rows and cols deduced from py array (i.e do not require those in the python bindings)
5be6292: add stubs (i.e. python signatures, to enable IDE autocomplete)