prewiew graphics (Jim)

[james-bern]

• [ ] fillet
• [x] offset
• [ ] dogear
• [ ] drag
• [ ] scale
• [ ] rcopy
• [ ] lincopy?
• [ ] mirror x and mirror y
• [ ] divide2
• [ ] CHECK FOR OTHER ONES

[NathanVosburg]

seems reasonable for alpha considering other functions support it

[NathanVosburg]

note from mirror issue " fillet preview (the filleted corner should grow out of the relevant corner all beautifully or something) #123 "