roo_display 1.4.0

Fixes:

• Many bugfixes in smooth arc rendering. Now works well for corner-cases, and is suitable for animations. Also, tuned its performance somewhat.
• Added missing FS dependency, which could cause trouble in some builds.
• Some tunings in background_fill_optimizer.
• Alignment objects are now comparable for equality.
• Directory rename: for simplicity, roo_smooth_fonts has been renamed to roo_fonts. The old headers are left there for backwards compability.