Tag implication removal: >:d -> >:)

I think >:) should only be used with a closed-mouth smile (separate from >:d), kind of like how ;) and ;d are used currently. In that case, the implication shouldn't be in place.

Sounds good...

Full support.

Removed it

I've modified the wiki and did some careful tag cleanup of >:) >:D so that only results with both expressions are present in the tag. Some of the flashes I have not checked because I can't or don't want to bother (I confirmed both expressions in post #216771, post #511526, and post #1023902, but not the others).

Speaking of which, similar to this maybe we could change these aliases to implications and adopt the closed mouth definition:
:) -> smile
:( -> frown
The downside is that it will be way too time consuming to completely populate, but at the time being it's particularly hard to isolate regular closed-mouth smiles due to all the implications leading to smile.

Keep in mind we also have light_smile for a subtle closed-mouth smile, and it doesn't implicate to smile proper. We could debate if we want to keep things that way, but that's the pattern I've been using.