Some outstanding TODOs for v2

[Datseris]

I see them as I go through #187

• [x] rewrite transfer operator based on the new API for the rectangular encoding. Done in #200
• [x] OrdinalPattern docstirng and probably source code needs to be redone based on new encode API. Done in #195.
• [x] Same for GaussianCDFEncoding. Done in #199.
• [x] Search source code for TODO comments. Address as many as possible, make the remaining GitHub issues and delete TODO from the source code. Done in #195.
• [x] separate the documentation of the entropy with hte entropy estimators into a different documentation block. especially since you say they compute differential entropy. Done in #191.
• [x] re-introduce other complexity measures. Done in #196.

[kahaaga]

separate the documentation of the entropy with hte entropy estimators into a different documentation block. especially since you say they compute differential entropy.

I have a reorganized set of docs ready for this already. I'll PR it when #187 is done.

[kahaaga]

Should we add "re-introduce other complexity measures" here to this list? Or do we do that after we release 2.0?