patterns: Added RGBDS object file format

[ISSOtm]

Hello! Thank you for this very fun hex {viewer, editor, ...}

As part of trying it out, I wrote a pattern for a file format I use very often now. Hope you'll like it :)

[ISSOtm]

(Note: I don't know why, but all of the NullStrings fail to display, with runtime error: No variable named 'data' found..)

[WerWolv]

Thanks a lot!

(Note: I don't know why, but all of the NullStrings fail to display, with runtime error: No variable named 'data' found..) That's my fault, easy enough to fix though