fix entity.location.standing_on for slabs

standing on a slab would return the wrong block
Add tag player.groups

A full list of all known permission groups that the player is in - works
offline :D
Add a horse jump strength property

Yay for controlling jump power more easily!
Add tag cuboid.center[...]

A fun tag to get the center a cuboid (if it wasn't obvious). Uses
semi-complex internal math that for some boring reason Bukkit locations
don't natively support.
Add cuboid.intersects[cuboid]

Hooray, simple game-physics is now available!
Add some meta

- remove silly meta
- add equip armor meta
- add todo note
- fix random requirements (no args are required, bracing is sufficient)
Add tag location.distance_squared

Yay for efficient mathematics!
Micro-efficiency boosts

A variety of ways to increase the efficiency of Denizen running scripts
Don't allow boolean comparables

Throw a warning if we get another unknown comparable
[BREAKING] Rewrite tag parser - no nested tags!

<<player>.name> is NO LONGER VALID!
<player[<player>].name> however, remains valid.
Also, add dList to the comparable options.
Allow some special tag nesting cases

Fallbacks and values should be allowed to contain tags
Add list[] and cuboid[] tag base units

A way to easily get a cuboid or list from random tagged input, also a
few corrections.
Correct rare bracketting issue

Brackets are only valid if the text ends with a bracket
Update version to Denizen 0.9.6

To represent the changes in the internals
Handle highly invalid definitions

Defs are never valid without a queue reference.
Also patch some meta.
Add an item scroll smart event

An event for when you scroll through your hotbar.
Allow iron doors in the switch command

iron doors aren't switched by interacting, they need custom handling.
Also, patch a regex.
Better YAML error messages

Fix spacing, add the ID given in the debug to be safe
Fix potential argument parsing error

"argument:" would fail to parse previously.
Also, patch meta.
Debug run command definitions

The run command wouldn't output the definition list... now it does.