Add ScreenScraper configuration to GUI menus

All entries of the new ScreenCcraper config block should be integrated as a Scraper sub-menu:

## Scrapers
### ScreenScraper.fr
### Force media region - if not defined, region is taken from system.language. Default: us
;scraper.screenscraper.region=eu
### Force text language - if not defined, region is taken from system.language. Default: en
;scraper.screenscraper.language=fr
### Choose the media to download among:
### screenshot: game screenshot
### title     : game title screenshot
### box2d     : Front case
### box3d     : 3D rendered case
### mixv1     : Recalbox special mix image V1 (default)
### mixv2     : Recalbox special mix image V2
;scraper.screenscraper.media=mixv1
### ScreenScraper account
;scraper.screenscraper.user=
;scraper.screenscraper.password=