Add attribute values to comments

[AaronB-Hub]

We can look up the hardcoded values for attributes (char/item/stage/etc.) from the dat files. These could be added next to their variables in the C code for reference.

Note that values may change between versions.

[ribbanya]

Permalink to previous work:

melee/src/melee/it/itCommonItems.h

Lines 96 to 116 in c39a958

	typedef struct HeartContainerAttr {
	s32 x0_heal; // [100]
	union {
	struct {
	u8 b0 : 1;
	u8 b1 : 1;
	u8 b2 : 1;
	u8 b3 : 1;
	u8 b4 : 1;
	u8 b5 : 1;
	u8 b6 : 1;
	u8 b7 : 1;
	} bits;
	u32 flags;
	} x4; // [999]
	s32 x8; // [1200]
	s32 xC; // [1140]
	s32 x10; // [120]
	f32 x14; // y velocity? [1.5]
	f32 x18; // y rotation? [0.0349066]
	} HeartContainerAttr;

Not sure what's the best way to do this. One option is to create Doxygen tag(s) for DAT values.