Enforce required arguments for asm macros.

[luckytyphlosion]

Not all directives actually require an argument to work. For example, the macro get_protect_count requires a byte argument for the target as seen in the macro definition:

	.macro get_protect_count target
	.byte 0x51
	.byte \target
	.endm

However, omitting the argument will not produce a compile time error, and will instead output the following:

    .byte 0x51

From the docs:

.byte expects zero or more expressions, separated by commas. Each expression is assembled into the next byte.

Therefore, by not specifying an argument, it will just skip emitting a byte at all.

This can be fixed by using the :req specifier, which will enforce all arguments be specified:

	.macro get_protect_count target:req
	.byte 0x51
	.byte \target
	.endm

Example assembler error output:

data/battle_ai_scripts.s: Assembler messages:
data/battle_ai_scripts.s:2028: Error: Missing value for required parameter `target' of macro `get_protect_count'

[aaaaaa123456789]

Seems good to me. Nothing good can come out of broken macro usage.

[DizzyEggg]

That's awesome Lucky. I always thought it had to be this way lol. And I had many bugs because of it, awesome find!