Fixes #201

All existing behavior works the same, except now fuzzy dates are only replaced when using the proper syntax with no spaces between the guards.

This PR actually solves another problem which I ran into along the way, which is that if the guards exist in the block before you type out the fuzzy date syntax, the fuzzy date won't function properly due to the regex.

Example:
I want to do x; I plan to do it ;tomorrow;

This wouldn't work because the regex picks up ; I plan to do it ; instead of tomorrow. Per my knowledge of regex, there is no magical regex solution to get all of the "substrings" (i.e "; I plan to do it ;" AND ";tomorrow;"), so I generate every substring and loop over them to check for a fuzzy date, making sure the format is valid too (i.e no spaces or other words - JUST the fuzzy date).

So this PR makes it to where you can actually use a ;fuzzy_date; wherever regardless of how many instances of the guard already exists in the block.

Lmk if you have questions.