Re-implement all nodes in C++

[bitbrain]

read #285 for the announcement for Beehave 3.0

Re-implement all current nodes in C++ - also ensure the corresponding unit tests will pass.

[bitbrain]

Use this branch as a base: https://github.com/bitbrain/beehave/tree/v3

[Adwait-Codez]

what about https://github.com/bitbrain/beehave/tree/v3-nodes ??

[bitbrain]

@Adwait-Codez good shout. I have not resumed work on it due to personal obligations. Feel free to pickup the branch: TODOs can be found here #287