Pype 3.0 - command and install refactoring

[antirotor]

Feature

This is first step towards new Pype 3 infrastructure. It dissolves pypeclub/pype-setup into pypeclub/pype. It provides basic build infrastructure to build/freeze Pype into standalone self-contained application. All required repositories are now added as git submodules into repos folder.

You can either clone it and init submodules in one step:

git clone -b 3.0/refactoring --recurse-submodules git@github.com:pypeclub/pype.git

Or if you already cloned pype just run:

git submodule update --init --recursive.

Building Pype

Windows

You will need Python 3.7 and newer and git.

Clone repository:

git clone --recurse-submodules git@github.com:pypeclub/pype.git

Run PowerShell script build.ps1. It will create venv, install all
required dependencies and build Pype. After it is finished, you will find
Pype in build folder.

Pype is build using CX_Freeze to freeze itself and all dependencies.

Closes #211
Closes #176
Closes #76
Closes #7

[antirotor]

This doesn't work yet BTW. It should build OK under windows and print help, but pype_commands (former PypeLauncher) is not implemented yet.

[mkolar]

Let's merge this and start cleaning up with all other code.