Improvements to Nametags module

[RealMuffinTime]

Type of change

• Bug fix
• New feature

Changes to Nametags module

• add TNT minecarts (TNT entities were present, but TNT minecarts not)
• ignore empty ItemStacks (sometimes it was possible to see Air 0x items if these were dropped and picked up fast)
• more default values (Module didn't had any hints on providing features for these entities)
• better description (Module didn't had any hints on providing features for other entities than players)

How Has This Been Tested?

Checklist:

• My code follows the style guidelines of this project.
• I have added comments to my code in more complex areas.
• I have tested the code in both development and production environments.

[RacoonDog]

Overall LGTM, though I dont think the defaults for the entity whitelist setting should be changed

[RealMuffinTime]

Should I then put the possible custom nametags in the description?