Added a number of foot prints for valves from Belton and Dongxin

Created by: Misca1234

After consulting William from Ierland at at www.radiomuseum.org https://www.radiomuseum.org/forum/seeking_help_with_foot_prints_in_kicad.html and Peter Qvortrup from audionote.co.uk

The following conclusions can be drawn

1. Almost no new PCB designers with valves include a valve PCB socket. They are all chassis mounted instead. This is due to the heat the valve radiate and the force needed to insert the valve in socket, it might damage the PCB in various ways.

2. Manufactures of valve sockets comes and goes, there is no standard of their size or look This means that sockets that look "identical out" one year might be different in 5 years with just a little difference => need to bring out the drill and modify the PCB to get the socket to fit.

However, I made a couple PCB sockets anyway, from the two manufactures I found, Dongxin and Belton. I am not sure if there is any point to review them

They are all script based, both foot print, sockets and valves

Foot print push https://github.com/KiCad/kicad-footprints/pull/1139

3D model push https://github.com/KiCad/kicad-packages3D/pull/477

Foot print script push https://github.com/pointhi/kicad-footprint-generator/pull/226

3D model script push https://github.com/easyw/kicad-3d-models-in-freecad/pull/237

But no cloud without silver lining, those of you that read this can the rest of your life brag that you was there, there, when the least used foot prints in kicad including 3D models with the most work effort behind was merged.

Valve_Noval-B9A: pkg_datasheet: "https://en.wikipedia.org/wiki/Tube_socket"

Valve_Noval-B9A_Belton-VT9-PT_Socket: pkg_datasheet: "http://www.belton.co.kr/inc/downfile.php?seq=58&file=pdf"

Valve_Noval-B9A_Belton-VT9-PT-C_Socket: pkg_datasheet: "http://www.belton.co.kr/inc/downfile.php?seq=58&file=pdf"

Valve_Noval-B9A_Dongxin-GZC9-A_Socket: pkg_datasheet: "http://www.etubesocket.com/sdp/218870/4/pd-831172/1790289-416013/GZC9-A_GZC9-A-G_9-pin_ceramic_socket.html"

Valve_Noval-B9A_Dongxin-GZC9-B_Socket: pkg_datasheet: "http://www.etubesocket.com/sdp/218870/4/pd-831172/1790283-416013/GZC9-B_GZC9-B-G_9-pin_ceramic_socket.html"

Valve_Noval-B9A_Dongxin-GZS9-Y_Socket: pkg_datasheet: "http://www.etubesocket.com/sdp/218870/4/pd-831172/1790186-416013/GZS9-Y_GZS9-Y-G_9-pin_plastic_socket.html"

Valve_Magnoval-B9D_Dongxin-GZC9-Y-2_Socket: pkg_datasheet: "http://www.etubesocket.com/sdp/218870/4/pd-831172/1790236-416013/GZC9-Y-2_GZC9-Y-2-G_9-pin_ceramic_socket.html"

Valve_Miniature-B7G: pkg_datasheet: "https://en.wikipedia.org/wiki/Tube_socket"

Valve_Miniature-B7G_Dongxin-GZC7-Y-B_Socket: pkg_datasheet: "http://www.etubesocket.com/sdp/218870/4/pd-831172/2057808-416011/GZC7-Y-B_7-pin_ceramic_socket.html"

There is no "clean Octal-K8A foot print, becosue of its center pin with spigot

Valve_Octal-K8A_Belton-VT8-PT_Socket: pkg_datasheet: "http://www.belton.co.kr/inc/downfile.php?seq=49&file=pdf"

Valve_Octal-K8A_Belton-VT8-PTS-B_Socket: pkg_datasheet: "http://www.belton.co.kr/inc/downfile.php?seq=49&file=pdf"

Valve_Octal-K8A_Dongxin-GZC8-Y_Socket: pkg_datasheet: "http://www.etubesocket.com/sdp/218870/4/pd-831172/1784598-416012/GZC8-Y_GZC8-Y-G_8-pin_ceramic_socket.html"

Valve_Octal-K8A_Dongxin-GZC8-Y-2_Socket: pkg_datasheet: "http://www.etubesocket.com/sdp/218870/4/pd-831172/1784584-416012/GZC8-Y-2_GZC8-Y-2-G_8-pin_ceramic_socket.html"

Valve_Octal-K8A_Dongxin-GZC8-Y-5_Socket: pkg_datasheet: "http://www.etubesocket.com/sdp/218870/4/pd-831172/1784484-416012/GZC8-Y-5_GZC8-Y-5-G_8-pin_ceramic_socket.html"

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Thanks for creating a pull request to contribute to the KiCad libraries! To speed up integration of your PR, please check the following items as you complete them:

• A screenshot of the model(s) aligned with KiCad footprints is very useful
• Was the 3D model(s) created in a mechanical modelling program?
• Source files (or scripts) have been contributed
• 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
• Geometry check performed against mechanical models