Added setting & functionality for tags in footers.

[source-toad]

I have added tweaked functionality to better handle custom tags used in tasks.

• Added setting for optional turning on or off of tags.
• Changed functionality to remove all tags from task content.
• Added tags footer to display tags in style below task content.

[source-toad]

[source-toad]

Noticed a bug where tags are not compatible with editing/moving of tasks. The tags are deleted when content is replaced.

[chrskerr]

Thanks @source-toad! I accidentally confused git, so I merged it directly into master, but thank you for this.

It's just been released.