Finish implementing decoding for remaining undefined-type tags

[dsoprea]

See bottom of tags_unknown.go:

go-exif/tags_unknown.go

Lines 387 to 392 in 9aa2497

	// TODO(dustin): !! Still need to do:
	//
	// complex: 0xa302, 0xa20c, 0x8828
	// long: 0xa301, 0xa300
	//
	// 0xa40b is device-specific and unhandled.

Tags with undefined types are size-unknown without additional handling, which means they are skipped when we construct a updated EXIF block. So, at the current moment, these tags will be dropped when an EXIF block is updated.

[dsoprea]

Closed in v2.