Add v1_16_R3 Adapter

[NikitaCartes]

This is almost my first experience with bukkit/spigot plugin so I can did something wrong.

Difference between v1_16_R2 and v1_16_R3

I checked here for differences in mapping but didn't notice anything that plugin use.

So I copied v1_16_R2 to v1_16_R3 with replacment.

And all works fine except one things:

> Task :v1_16_R3:compileJava FAILED
/home/nikita/git/UltraCosmetics/v1_16_R3/src/main/java/be/isach/ultracosmetics/v1_16_R3/nms/WrapperEntityLiving.java:110: error: dM() has protected access in EntityLiving
        return handle.dM();
                     ^
Note: Some input files use or override a deprecated API.
Note: Recompile with -Xlint:deprecation for details.
Note: Some input files use unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.
1 error

FAILURE: Build failed with an exception.

I don't know how to properly fix this, so I added dirty hack and always return 0 for this functions. Didn't notice any visual bugs for now.

Attached compiled jar in releases in fork, I think it can be useful.
https://github.com/NikitaCartes-forks/UltraCosmetics/releases/tag/2.5.10-beta.1

[lgtm-com]

This pull request introduces 4 alerts and fixes 1 when merging 6b00940 into 39fa1d6 - view on LGTM.com

new alerts:

• 3 for Dereferenced variable may be null
• 1 for Useless type test

fixed alerts:

• 1 for Type mismatch on container access

[Emibergo02]

it is handle.dN() for 1.16.4. fix it

[lgtm-com]

This pull request introduces 2 alerts and fixes 3 when merging 3e0cc44 into 39fa1d6 - view on LGTM.com

new alerts:

• 1 for Useless type test
• 1 for Dereferenced variable may be null

fixed alerts:

• 3 for Expression always evaluates to the same value