Add animation arc

• Thanks for PR #88 by @geantas

Template Customization

• Percent text size (max 60 to fit into the doughnut)
• Percent text color
• Percent count-up
• Percent count-up duration
• Label text size (max 22 to fit into the doughnut).
• Label text color
• Color validation (accepts HEX or CSS color values)

thank you to @geantas on #86

Added functionality for custom text at the center

• Added functionality for custom text at the center, see #2
• Bump all deps version, see e5ec0e4