API improvements for equipment

[redtortuga19]

get_all_tagged_in_rect direction_sort parameter added for North, South, East, and West directions. This functionality makes it easier to navigate from A to B by placing tile markers on the ground.

[redtortuga19]

@kelltom Sorry for the multiple features in one pull request, I'll make a new branch for each feature in the future. I thought that pushing this new code to my main branch would let me open a new pull request instead of modifying this one.

Additions:
get_is_item_equipped in morg_http_client. This lets us get around the wonky behavior in get_player_equipment placing additional -1s and you can just directly check if a certain item is equipped.

get_is_inv_empty in status_socket. Just a nice little function to check if inv is empty because the opposite of get_is_inv_full isn't necessarily empty and vice versa.

These 2 new functions and the direction_sort have all been tested with my bots.

[kelltom]

I'd be willing to convert this PR to a title of API improvements for equipment and pull in those changes. I'm a bit hesitant to include the cardinal sort when it has potential side effects should the camera not be north.

If you want, I can revert those changes and accept the merge. Then maybe a future PR could be made if you happen to find a way to do cardinal sort with consideration of the camera.