A few methods, a bug fix and performance improvements

• Added plugs.Math1D.inRange()
• Added plugs.Angle.unwind(), plugs.Angle.unwindShortest(), plugs.Angle.unwindPositive(), plugs.Angle.unwindNegative(),
• Fixed a bug on plugs.Vector.__neg__
• Expression nodes now evaluate on-demand rather than always

Full Changelog: v0.8.3...v0.8.4