[feature]: HUD display of boost duration remaining

[ApolloX939]

So far, very cool mod.

Something I think would be cool to add... a HUD displaying the boost name and the duration left till it "wears off".

An example would be:

fly: 44 seconds left

fast: 13 seconds left

[ApolloX939]

Todo:

• Fork Repo
• Build basic boost tracking (used to track total number of boosts, as this will be used to offset each HUD element, or a possible optimized version which uses only 1 HUD element, with newlines)
• Build HUD builder to display boost name, and duration
• Use a globalstep to build an updating HUD (updating the duration left for boosts)
• Test it (Testing will occur on Minetest 5.6.1)
• Pull Request

[ApolloX939]

Sorry, just been busy with other things to get to this.

I'll be testing my HUD soon, then I'll be making a PR.