store launch control info into eeprom

[rickyelopez]

Rather than always using default values, use data stored in eeprom. This should help if ever there's unintended restart of the car between accel runs. Don't want to have to reset this all the time,

• Define a "launch profile" structure to be used with add launch control "profiles" to the launch page #32
• Add "save" and "reset" buttons to launch control page
• Make the "save" button update the profile values in EEPROM
• Make the "reset" button reset the values to default