Add snapshot 23w31a support

[RobbeBaeyens]

add random command New form of the execute command: execute if function New form of the return command: return run Renamed belowName value in display slot argument in scoreboard command to below_name and most importantly allow macros and line breaks with \

[ShadowCreator250]

This repository is no longer maintained. Please use/go to the fork mentioned in the comment on #60 or any other fork.