GBA database updates

[HTV04]

Proposed changes:

• Updated the database format to prioritize the SHA-1, and remove the unused name field (reduces size from ~650 KiB to ~80 KiB). The u32 attribute was also modified only to include the save type, removing the encoded size (since this part of the attribute didn't have a purpose, and it leaves room for other parameters).
• Refined my conversion script (updated to v4.0), and also added a license.
• In open_agb_firm.c, renamed GameDbEntry struct to GbaDbEntry, and also adjusted the override menu check to jump to the end label instead of wrapping the menu code in a block.

[profi200]

I actually have more progress than i remember in my hand made db. I would leave the db currently being used in this repo anyway, because 1950 is still far from complete and i don't want users to complain their games don't work anymore with the latest build.

edit: All db entries not properly set have their attr field set to 0xFFFFFFFF.

gba_db_1950.bin.zip