Unit conversion

[daar]

Allow the user to enter a default unit. Internally the units are converted and the results are presented back in the unit according to the user. Example: entering image size in inches instead of mm

Units affected:

• Length (mm, um, inch, ft, m, cm, mil)
• Angle (deg, rad, grad)
  1. Implement 2 functions: ConvertLength(To, From) and ConvertAngle(To, From)
  2. Add a settings page where these can be set
  3. Use unit conversion internally everywhere