Fix some of the memory allocation in framebuffers (#182)

* Fix some of the memory allocation in framebuffers

Also includes a the questionable change of undoing a previously
 made match for func_80027A20. The changes made here remove an
 AVOID_UB usage and (I would argue) is therefore more "correct",
 but undoing a byte-for-byte match is admittedly bad.

Also adds in some header files and updates some not-quite-right
 decomps to be slighly more accurate.

Signed-off-by: Taggerung <tyler.taggerung@gmail.com>

include/common_structs.h

@@ -513,14 +513,6 @@ typedef struct
     /* 0x7F */ u8  checksum;
 } struct_8018EE10_entry; // size = 0x80
 
-typedef struct {
-    char unk_00[0x920];
-} struct_D_802DFB80; // size = 0x920
-
-typedef struct {
-    char unk_00[0x1000];
-} struct_D_802BFB80;
-
 typedef struct {
     /* 0x00 */ u16 red;
     /* 0x02 */ u16 green;