Add Crystal Murata XRCGB 2.0x1.6mm

Add Crystal Murata XRCGB 2.0x1.6mm

Datasheet Link: https://www.murata.com/~/media/webrenewal/campaign/ads/america/timing/p79e.ashx?la=en-us

• 3D model was created using FreeCAD
  • Source file pull request: https://github.com/KiCad/kicad-packages3D-source/pull/262
• STEP and WRL exported in correct scale (1:1 / 1:2.54) (using kicad stepup tools)
• 3D model alignment checked against KiCad footprint
• WRL model uses correct material properties
• Geometry check performed against mechanical models