Add adjustment method private data for selections add hooks for gamma_resolve_selection so that things such as EDID and connector name can be resolved with all required resources already loaded and readily available

Signed-off-by: Mattias Andrée <maandree@operamail.com>
Update MAX_LINE_LENGTH in config-ini to fit extra long EDID:s

Signed-off-by: Mattias Andrée <maandree@operamail.com>