Refactor networking configuration logic

[igorpecovnik]

Description

Refactor networking configuration logic to make it as easy as possible.

Implementation Details

• support for multiple interfaces which are being added to the bridge by default
• wireless adaptors in STA mode are not added to the bride as this method is not supported
• wireless adaptors in AP mode are added to wired bridge. hostapd is installed and enabled
• whole configuration can be set back to armbian defaults, which is DHCP on all wired interfaces
• while adding adaptor, it can be selected DHCP or fixed IP address
• old code for setting AP has been removed

Testing Procedure

• DHCP wired networking
• fixed wired networking
• wireless in STA mode
• wireless in AP mode
• reverting back to stock config

It was tested with various scenarios, by using Network Manager and systemd-netword networking. Further tests are needed to make this functionality beyond breaking.

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I have ensured that my changes do not introduce new warnings or errors
• Changes have been tested and verified
• I have included necessary metadata in the code, including associative arrays