Dev/learning rc 0.5 (#332)

* inheritance from base class

* inheritance from base connection

* floating point model

* minor cleanup

* added neuron base class

* separate models from process files

* rm init file

* inherit from Neuron and Connection

* merged LearningDense into Dense

* release candidate 0.5a

* beginning last clean

* clean in progress

* updated tutorial

* changes according to checklist made. missing use of np.where refactor

* changed evaluate_trace to use boolean indexing instead of np.where

* removed BITS_

* lint and poetry update

* moved tutorial to in_depth

* Licenses

* lint tests

* poetry update

* docstrings for connection and learning rule

* fixing typo

* minor optimization for floating point model

* added learning related unit tests

* added other learning related unit tests

* refactored docstrings

* merged Loihi1 and 2 LearningRules and added seed for RNGs

* fixing failing tests

* fixing lint errors

* fixing lint errors

* fixing failing tests

* fixing failing tests

* docstrings and minor changes

* adding apply_mask to learning/utils

* lint and rng seed

* pulled pyproject and poetry from main

* re-add asteval as dependency

* vectorizing decompose_impulses, adding some constants

* typos

* return of the LearningDense class

* Connection base class to reduce code duplication

* lint

* rm learning rule base class

* minor bug fix

* added tutorial for custom learning rules

* added test for LearningDense process

* pull lock and pyproject from main

* added tests for multisynapse learning

* use LearningDense in tests

Co-authored-by: gkarray <[email protected]>
Co-authored-by: Marcus G K Williams <[email protected]>