Item thickness when in hand with HD textures

Verification builds:
#332621

Summary:
Item in hand (FPS/TPS) has wrong thickness with HD textures

Impact:
Items look flat. Can't be fixed by content creator. Easy to fix and would be nice for a 1:1 result between MCPC and MCPE

Repro Steps:
1. Use a texture pack with >16x textures
2. Put any item in hand

Observed Results:
The item thickness directly depends on the texture resolution.

Expected Results:
The thickness should be the same between all RP, no matter the resolution.
Best would be to make it customizable.

Screenshots/Videos attached: Yes