Function Compiler

Re-adds support for some missing entity types

Adds selector argument: advancements

Adds commands:

• advancement <grant|revoke> <players> only <advancement> [criterion]
• execute if function ...
• execute unless function ...
• execute store result storage ... double
• execute store result storage ... int (now supports non-1 scale)

Fixes bugs:

• Texts with non-default styles don't compile (affects 1.21.4)
• function ... with storage <storage> <path> does not get run from within compiled functions
• execute unless score ... <operator> has flipped conditions