* various API functions now work with mobs properly
* the following effects don't work with mobs at all:
water breathing, dolphin's grace, leaping, swiftness,
slowness, slow falling, night vision, darkness, frost,
health boost, absorption, fire resistance, resistance,
luck, bad luck, blindness, nausea, hunger, saturation,
haste, fatigue, conduit power
* the following effects should work with mobs:
invisibility, regeneration, poison, withering,
strength, weakness, levitation, glowing
* the following effects have no effect on mobs
(but can be applied with the API):
bad omen, hero of the village
* abstracted and refactored some parts of haste and fatigue
* added and exposed new mcl_potions API functions
* fixed haste and fatigue not altering the hand
* mcl_meshhand now calls into mcl_potions when resetting the hand
* fixed a few crashes related to unusual effect levels
* added haste and fatigue combat functionality
* added some cleanup to avoid hangover unstackable items
* capped the slowdown from fatigue at 5 minutes digging time
* (despite the above, if a tool has a longer time set in definition,
that still works)
* removed an unused "global" variable
* added a way to have a damage modifier relying on type instead of flag
* added Slow Falling
* added Levitation
* added Health Boost
* added Absorption
* Fixed some effects not being replaced correctly with higher levels
* Implemented an old FIXME (MTE 5.3.0 fixed underlying bug)
* Added a way to obtain an approximate level of effect from factor
* Added effect level to HUD under the icon
* Added effect timer to HUD under the icon
-heal subcommand to the /effect reimplemented
-healing_func() from old API standardized, included in new API
-(the last point is due to it being substantially different from others)
-fixed a few bugs, potential crashes
-fixed incorrect withering effect progression
-standardized variable naming
-improved the /effect command, allowing to use effect levels
-fixed a bug in level-to-factor conversions
-renamed effect icons to follow the new convention
- added a `register_effect()` function
- added the withering effect
- registered all the old effects under the new API
- unified effect names
- updated the main effect checker to use the new API
- changed some hardcoded values to support the unified effect naming
- added new namespaced metadata effects strings
- added support for legacy effect player metadata
- potions are still using the old effects API
- added glue between old API calls and the new API
- renamed the effect icons to support the unified effect naming
