Added Traco TEC3UI symbols

Hi KiCad-Librarians,

Please find the symbols for the TEC 3UI series in this MR.

Footprint-Generator-MR: kicad-footprint-generator!1211

Footprint-MR: kicad-footprints!3745

Original datasheet: https://www.tracopower.com/products/tec3ui.pdf

All symbols are derived.

The following symbols are included in this MR (entire series):

• TEC 3-2410UI
• TEC 3-2411UI
• TEC 3-2412UI
• TEC 3-2413UI
• TEC 3-2421UI
• TEC 3-2422UI
• TEC 3-2423UI

TEC 3-2410UI symbol image:

Best regards,

Jens