Add support for hiking routes
Summary:
For hiking routes icon and line styles are set according to osmc-symbol tag.
Related Google Code-In task: https://codein.withgoogle.com/dashboard/task-instances/5054825672736768/
Test Plan: tested it the way @nienhueser suggested ( https://paste.kde.org/pkly9kacd )
Reviewers: rahn, nienhueser
Subscribers: nienhueser, rahn
Differential Revision: https://phabricator.kde.org/D3918