Seznam autobusů and vagonWEB formations for transit maps

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

Specific support: SŽ – button for vagonWEB and link to ČD train details PID – button for vagonWEB, ČD train formations and link to ČD train details JMK – button for vagonWEB and display of train number IDESKA – button for Seznam autobusů (Bus List), button for vagonWEB, ČD train formations and link to ČD train details ODIS, IDZK, IDOL – button for Seznam autobusů (Bus List), button for vagonWEB and link to ČD train details PMDP, Jablonec – link to Seznam autobusů (Bus List) and location button DPMD – link to Seznam autobusů (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).