Status bar

Added

• Status bar items and commands for:
  • Navigation: First/Previous/Go to Page/Next/Last and Back/Forward commands
  • Zoom: Zoom Out/Zoom Mode/Zoom In
  • Rotation: Rotate Left/Rotation Angle/Rotate Right
  • Spread Mode
  • Scroll Mode

Initial release

• Open and save PDF documents
• Hide Open, Print and Download buttons
• Apply VS Code theme colors