Function Compiler

Adds commands:

• execute as
• execute if entity
• execute if score
• execute run
• function (without arguments)
• kill
• scoreboard players add
• scoreboard players operation =
• scoreboard players operation +=
• scoreboard players operation -=
• scoreboard players operation *=
• scoreboard players remove
• scoreboard players reset (no objective)
• scoreboard players set
• tag add
• tag remove

Adds selectors: player name, UUID, @a, @e, @s

Adds selector arguments: limit, tag