Complete refactoring + All Entities filtering

replace reflection by simple use of getId method.

update Readme to add info about all entities availables.

Beta 0.3.0

• Add "/mobcount list" to show the list of recorded zone.
• Add "/mobcount zone ZoneName" to use mobcount with an existing zone (formerly without "zone" which could lead to collision)
• Add possibility to define a zone by selecting (right click) two block with a Kelp in the hand. Not yet possibility to filter the entity type in this mode

Full Changelog: Beta...Beta3

Beta 0.1.0

This release add the record of a zone or delete of a zone.

example of record a zone:
/mobcount -6 -60 5 -13 -60 -5 COW set zoneCow

delete a zone:
/mobcount del zoneCow

Alpha 0.0.1

Implement Count of

• Chicken
• Cow (Does not include Mushroom Cow)
• Pig
• Sheep

Currently request two coordinates as 2x3 signed number.