Rearrange build infrastructure

[NaitLee]

From today’s view it’s messed up. I hope this can be done to make it better and address some problems like #48.

[sync1211]

I recently started porting the build scripts to Makefile as it allows for greater customization. (Makefile-Branch)

To create a bundle, the user would only need to run make, instead of 0-prepare.sh && cd build-common && python build.py $version

[NaitLee]

I remember a long time ago there is #16. I didn’t yet merge it.

One existing problem is Windows building is broken. Even if it’s fixed, it’s going to break again later time.

Python is unfriendly at this… you can’t get bleak-winrt via pip on *nix, but need to manually take the .whl file from pypi (it’s a zip file), then do some dirty work embedding to python, then test it on a real Windows machine — which became unacceptable to be by time.