GOLEM core 0.7.0

Hi, folk!

This release marks major change! Our team separated all the core modules (graph, adapter, optimizer, tuner etc.) into the separate project GOLEM (https://github.com/aimclub/GOLEM).

FEDOT now contains modules related to Data handling, preprocessing, machine learning logic like Pipeline (implementation of ML Graph), ML operations, ML metrics.

There're also few other changes:

• #1029 -- CLSTM model refactoring
• #1046 -- Transition of GitHub tests from Python 3.7 to 3.8