Misc Cleanup 2 (#1007)

* Cleanup `UNK_TYPE`, `UNK_PTR` usage

* Add some missing empty lines after declarations

* Remove some legacy comments from non-matching times

* Fix some grammar (mostly "it's"/"its")

* Use proper names for two symbols after ZAPD bugfix

* Cleanup `place_title_cards.xml`

* Use `NULL` to check against `D_8012D260` pointer

* Parentheses around some macro arguments

* wip proofread headers up to z64animation.h

src/code/jpegdecoder.c

@@ -166,6 +166,7 @@ u16 JpegDecoder_ReadBits(u8 len) {
     u8 data;
     s32 ret;
     u32 temp;
+
     ret = 0; // this is required for some reason
 
     for (byteCount = sJpegBitStreamBitIdx >> 3; byteCount > 0; byteCount--) {