Consider dropping biokit dependency

[Donnyvdm]

When trying to update the code and its dependencies, I ran into some issues.

Some originate from the Biokit package. Biokit is quite a large package to install with many dependencies, and it has a warning on its homepage that the content is moving to another package. In fact, on Windows I cannot install the Biokit package at all under python 3.9 with either pip or conda.

In GDSCTools, the Biokit package is hardly used. The only references I could find were in the PANCAN-Reader and Extra-Reader, which are both already deprecated and in Regression.dendogram_coefficients if the show-parameter is set to True.

If we could deprecate the show-parameter of this method or rewrite the heatmap-functionality from biokit.viz directly into GDSCTools, we could drop the dependency on Biokit, which could ease the installation path.

@cokelaer I'd like to get your opinion on this.

[cokelaer]

@Donnyvdm I have a fork of gdsctools on my account. There, I have copied the heatmap module from biokit to gdsctools. I wrote biokit a while ago and did its part of the job but there is no need indeed for all the package. The heatmap is easy. I just copied/paste into gdsctools. For the other functionalities (The Extra-reader), I will keep it there for now but the imports are in the class so no need to have the biokit package in the requirements.txt

[cokelaer]

I have also fix all the deprecated warning/issues related to pandas/numpy/statsmodels and thanks to the test suite, I could manage to check carefully that it should give the same results in most of the functionalities.

I have also added a continuous integration directly into CI actions (github) so future changes should be easy to check for you or others with pull requests.