Made the Splash editor respect the 9x/Taranis LCD widths in a consistent way. Previously everything was displayed as a Taranis bitmap.
Pictures larger than 9x width will get scaled to Taranis width (212 pix).
Fixes width bug for 212 wide images.
Merge branch 'origin/next'
Merge pull request #690 from opentx/dvogonen/splasheditor_width_bug

Merging this so I can close my two conflicting branches.