v.2.1

• dropped windows 7 and windows 8 support
• use windows image coding (wic) library
• improved multi-monitor support
• added right-click context menu on region screen
• added fullscreen mode capture
• added timer feature (issue #27)
• added arm64 build
• fixed overlapped windows rectangle calculation
• fixed update checker bug (issue #25)
• fixed region selection (issue #31)
• fixed shadow size calculation
• fixed painting cursor
• fixed internal bugs
• updated project sdk
• fixed bugs