Choose color for task lists

[abaker]

Tasks.org allows users to change task list colors, but disables this functionality for OpenTask lists because it cannot modify the color in the content provider

This is similar to #3, but unfortunately can't be solved by a third party app

[39aldo39]

Thanks for the notice! I didn't realize that tasks.org couldn't modify the color, so it looks like I have to add the functionality.

[abaker]

I just tested it out, thanks for the quick fix!