New placeholders and fixes!

[BlitzOffline]

Closes #1
Closes #2
Closes #3

Adds:

- %world_fulltime_<world>%           # Gets the full time the world has ran for (this value can be changed by plugins and does not update if the day cycle is stopped)
- %world_fulltime_strict_<world>%    # Gets the full time the world has ran for. It is the exact time that the world has ran for and can not be modified by anyone or anything. It only works on 1.16.5 and higher though
- %world_entities_<world>%           # Gets the entities count in a world
- %world_entities_living_<world>%    # Gets the living entities count in a world

Fixes:

• %world_recentquit_<world>% placeholder (it displayed the same value as %world_recentjoin_<world>%
• NPEs when parsing %world_biome% and %world_nearbyentites_<radius>% with null or offline player.

Other:

• Upgrades from Gradle 6.5.1 to Gradle 8.13
• Swaps from Gradle Groovy to Gradle KTS
• Caches regex pattern
• Adds missing annotations