Constructions should be avoided and assuming a daily re-import we should recognize the conditional tag including the date format defined in opening_hours.

First major part is implemented already in #621. Still missing:

• multiple conditions separated by ;
• Hourly-based restrictions, see Conditional Access Restrictions #621
• opening_hour parsing for ferries and other barrier nodes (e.g. for parks)
• Things like: easter, PH, SH, summer, winter, ... dependent on Country-specific speed limits #175
• no @ week 1-5