Proposal for fix of #6 - Githubissues

Hi,

I got the GUI to display in correct colors. But I don't fully understand your (or Minecraft's) flickering code.

Essentially it applies the custom lighting only to the world render phase and applies afterwards Minecraft's own lighting.

To test, you can use this tiny test resourcepack: lightmap-bug.zip

Go into the Nether:

Without my PR all GUI (inventory, texts, etc.) will get yellowish and will stay even after returning to the main menu.
With my PR the custom lightmap gets applied, but all GUI including the main menu stay in correct colors.

kvverti / colormatic