Feature Request: new special sequences to display file tags

[alexgeirby]

Hi again.

It would be great to be able to display tag values from a note. Is it possible to add, for example, two special sequences:

• $iftag:NAME:STRING1:STRING2 - returns STRING1 if tag named NAME exists in file (as #NAME or in frontmatter) or STRING2 otherwise. If :STRING2 part is omitted, it equals to empty string. If whole :STRING1:STRING2 part is omitted, it equals to full form sequence with STRING1 equals to NAME and STRING2 equals to empty string.
• $subtags:NAME - returns comma-separated subtags of tag NAME if these subtags exists in file (for example, if file contains tags: [A/B/C, A/D] in frontmatter and #A/E somewhere in file body, $subtags:A sequence would return string B/C, D, E

Thank you so much for this awesome plugin!

[mrjackphil]

I'll think about more generic approach. I think those if statements could be useful for other sequences as well.