An update to my KiCAD library for obsolete LED

I got a new batch of old LED displays and before doing something with them I needed a KiCAD symbol and footprint.

So I added TIL308 and TIL309 to my KiCAD libraries. Also fixed TIL306 and TIL307 that were missing their respective symbols.

My KiCAD library of obsolete displays (Nixie, VFD, LED) is published on a github repository.

Meanwhile I confirm that TIL311 symbol and footprints are correct since I got PCBs, built them and I am enjoying the result.