[TWRP Flashable] Materialized Bootloader UI + Bootloader unlocked warning removal

[zys52712]

Something that I made a while ago, it basically adds the new bootloader ui from newer phones, has a improved bootlogo that's crisper than the original and some other improvements.

Check it out here
https://forum.xda-developers.com/droid-turbo/themes-apps/materialized-bootloader-ui-t3562790