Function Compiler

Adds commands:

• execute anchored
• execute on vehicle
• return <value>
• return fail

Adds 1.21 support

Adds selector: @n (1.21 only)

Adds local coordinates

Adds /mcfc for enabling/disabling running compiled code, requires permission level 3 to use

Adds commands:

• data modify storage <storage> <path> set value <value>
• execute store result storage <storage> <path> int 1
• function (with argument support)

Adds selectors: @p, @r

Adds selector argument: sort

Adds nbt support internally

Adds nbt paths: foo.bar, foo[0]

Adds a better instruction optimizer

Functions compile in the background now

Fixes bugs:

• @e returned dead players
• Commands which remove entities from the world broke selectors
• execute align does not work
• Using /function in non-compiled functions does not run the compiled variant (affects 1.20.4+)

Fixes bugs:

• The game crashed after a attribute that isn't a RangedAttribute was loaded

Adds commands:

• effect
• experience add/xp add
• experience set/xp set

Adds selector arguments: distance, level, name

Fixes bugs:

• gamemode selector overwrites previous gamemode selectors
• Rotations with relatives angles cause an exception at runtime (affects execute rotated <rotation> only)

Adds commands:

• execute rotated as
• execute rotated
• execute positioned as

Fixes bugs:

• team selector overwrites previous team selectors
• team selector fails to compare team names properly
• Positions fail to parse with a ~ without a number after it
• Using objectives which don't exist causes an exception when running the command
• Using a command that accepts a scoreholder can break at compile time (affects execute if score only)
• Comparing two scores together reverses the operator (a <= b became b <= a in compiled code)
• 1.20.1 code fails to call external functions due to missing access widener entry
• Some selectors fail to parse properly with whitespace