Add "system information" screen

[GerbilSoft]

Add a "system information" screen. Some information that would be useful to display:

• System model (SEEPROM 0x170)
• System serial number (SEEPROM 0x158, 0x160)
• Security level (OTP 0x80; indicates retail, debug, or factory)
• Board type (SEEPROM 0x042)
• Boot source (SEEPROM 0x046; usually N1, need to check if PCFS changes this)
• SATA device (SEEPROM 0x058; number and description)
• Console type (SEEPROM 0x05A; number and description)
• Product area, game region (SEEPROM 0x148, 0x14C; mirrored from sys_prod.xml; my WUP-101(02) says prod_area=2, game_region=0?)

I might try adding some of these myself later this week.