Add anti-aliasing to line

[Dangry98]

Blender merge tool, add anti-aliasing to line

[Dangry98]

• Don't hard code the line width. Use the add-on user preferences which are in prefs.line_width and prefs.edge_width
• If we're adding anti-aliasing to class DrawLine() we should also add AA to class DrawLineDashed()
• Must maintain backwards compatibility with Merge Tool's current minimum supported Blender version (2.93) OR Stromberg90 must authorize raising the minimum supported version.

Thanks for the quick response, will try adress the issues when I have time.