Can only run .g and .gcode files
Hidden config and firmware files in menu
Fast file menu
File menu filters files other than .gcode, .g, no extension files and folders
Spelling fixes
Merge pull request #443 from GeorgeHahn/patch-1

Spelling fixes in config
Faster menu scrolling
Merge branch 'upstream_edge' into Sunbeam_edge
Add in WatchScrean auto hide temperature when extruder/extuder2 or bed/pcb thermistor not connected.
Add in ExtruderScreen auto hide when extruder or extruder2 not connected.
Rename name in PrepereScrean Extrude -> Extrude/Retract.
Merge branch 'Sunbeam_edge' into Sunbeam_rev_C