FYI: Changes required for Zephyr 1.13

[pfalcon]

Zephyr 1.13 has some refactoring which required updates to the client apps. Here's the list I know about:

1. Net configuration lib was split from net_app lib. A few config options were renamed from CONFIG_NET_APP_* to CONFIG_NET_CONFIG_* . An example of the changes required can be seen at pfalcon/pycopy@f27f79d .
2. There're also some CMake related changes, Z.js may be affected or not. Example of changes at pfalcon/pycopy@1b0f05a

[pfalcon]

Superceded by #1899