Josm template split

I have split up the JOSM templates because of following reasons:

1. Navigation was to deep (especially for signals)
2. Separation of international tagging and country-specific tagging. User should be able to select the presets they need in their country. For example, a German mapper would install infrastructre, DE-ESO (railway) and DE-BOStrab (tram) presets.

I also included all changes in tagging scheme we agreed on in Cologne.

I added German signal abbrevations in order to make navigation for railway-affliated mappers easier.

Please inform community via mailing list about the splitted presets before merging this pull-request.