* Restore audio test
add the possibility to choose audio from audio delivered with original firmware
or choose audio from /system/sdcard/Media folder
* Update action.cgi
Fix a typo and add missing quotes
* PEP8 for python scripts
* Format HTML
* Cleanup scripts using shellcheck. Whitespace. Removed unused variables and a "dead cat"
* Cleanup script using shellcheck. Whitespace. Refactored a fragile for loop and removed a "dead cat"
* Cleanup scripts using shellcheck. Whitespace. Refactored a chain of grep commands in mqtt-control.sh.
* Cleanup scripts using shellcheck. Whitespace. Removed unused commented code and dead cats.
* Format changes for consistency