Seznam autobusů and vagonWEB formations for transit maps

Adds links to Seznam-autobusů.cz (Bus List) and vagonWEB and downloads ČD train formations to traffic maps of Czech (and Slovak) transit companies.

Specific support: PMDP – Bus List link and location button SŽ – button for vagonWEB and a link to the ČD train detail PID – button for vagonWEB, ČD train formations and link to ČD train details Jikord – button for DPČB Bus List, button for vagonWEB, ČD train sorting and link to ČD train details JMK – button for vagonWEB, replacement button for ŽelPage DÚK – link to vagonWEB DPMD – link to Bus List ŽSR – link to vagonWEB

Parts of the code are inspired by the extension Řazení ČD pro Interaktivní mapu a GRAPP by Kateřina Miháliková (https://chromewebstore.google.com/detail/bjomckdmonhmampoglcppieincjighce).