Modernize OTP UI components

[caleb-diehl-ibigroup]

Would like to make some styling changes to OTP UI components to modernize the UI (mostly on the route and stop viewers). Some examples:

• style the stop viewer icons and configure to use agency primary color
• remove lines, add spacing, and change colorful boxes to the Metro UI route badge on the route viewer grid
• replace green check marks for checked mode buttons with agency primary background color
• restyle trip details box
• remove grey box on headers
• replace basemap with mapbox-light
• update the to and from icons
• consistent styling for all dropdowns and buttons