export support

[clach04]

I have a rough and ready version that allows exporting the contents of the watch into the config page.

See https://github.com/clach04/PebbleChecklist/wiki

[tilden]

This seems like a good idea, I will try to target it for 2.0.

[clach04]

I'm still using this build https://github.com/clach04/PebbleChecklist/releases/tag/export_v0.2 if you want to play with it first.