Unhardcode some powers of certain origins

[eggohito]

This PR adds new power types to be used in place of the simple power type in some powers of certain origins, such as Merling and Feline, for further re-usability of the powers in custom origins.

The power types currently does not provide fields for customization (but all of it still supports the condition field), and will likely never have such fields as these power types are essentially just the precursor for its corresponding generalized types that may be implemented in the future (if possible to implement.)

These are the power types that will be added by this PR:

Type	Description
origins:like_water	Prevents the entity from sinking to the ground when underwater if the entity doesn't have downwards velocity.
origins:water_breathing	Makes the entity only be able to breathe underwater.
origins:scare_creepers	Scares away creepers within 6-blocks cuboid radius.
origins:water_vision	Prevents the slight reduction on the player's vision when just submerging into water.
origins:conduit_power_on_land	Makes the player receive the "Conduit Power" status effect from active Conduits even if the player is not touching water.