Support RTL languages

[MaxWasserthal]

Ideation

• Popover views do not adjust for right-to-left layouts
• Changing the device layout flips all elements but the popovers are always positioned using the physical left & right.

Changes

• Add view's device orientation to the Popovers Context
• Adjust positioning calculations
  • Instead of defining static left / right sides use leading / trailing sides based on device orientation
  • Invert horizontal paddings and offsets if applicable

Testing

• Test these changes by changing the schemes AppLanguage to Right-to-Left Pseudolanguage
• The popovers using absolute positioning should be anchored from the opposite side
• Rubberbanding should not be affected by the change in layout orientation