Feature Request: Expose config.ap_fallback

[Indemnity83]

There doesn't seem to be any way while using the flash tool to set the ap_fallback mode to true. Would you be willing to accept a PR that either added a checkbox to the UI for the ap_fallback config option.

An alternative could be to accept an external config.json but that functionality is likely beyond my ability to implement.

[MartinMueller2003]

I just added the ability to retrieve a config file from the running ESP. That means I added a parser to make this functionality work :). I will add general support for controlling this setting via the flashtool.

[MartinMueller2003]

FYI: The default value is "true".

[MartinMueller2003]

Just created a PR that addresses this and additional issues from the ESPixelStick issues pages.