Add SMD silicone rubber switch TSF-1266 model

• Soundless rubber tact switch for long life applications
• Footprint added at MR3402. All details are mentioned there

• A screenshot of the model(s) aligned with KiCad footprint(s)

• Source files are contributed on the appropriate location
  • MR393(https://github.com/easyw/kicad-3d-models-in-freecad) pull request
• Step model submitted in 1:1 scale
• WRL model submitted in 1:2.54 scale
• 3D model alignment checked against KiCad footprint
• WRL model uses correct material properties
• Materials set in FreeCad. Assume that export function works in FreeCad correctly
• Geometry check performed on the model