Time is up

Obfuscation mapping updated to official 1.16.5.

## Added ##

- Commands : 

      - /timer <player> (set | add) <time> [(dimension)]  :  allows you to set or add duration to <player>'s timer for current or specific dimension.

- Game Stages mod integration : you can "unlock" a dimension (remove the timer) by adding the corresponding stage to the player.

      - Stage format : timeisup_<modid>_<dimension_name>

      - Example : for the nether with the id "minecraft:the_nether",  the corresponding game stage is "timeisup_minecraft_the_nether".