1.8.0

• resolve issues with chart markers not being removed after calling the clear function
• resolve alignment issues with iOS devices
• completely remove L.GPX dependency inside the L.GpxGroup class (gpx examples)
• additional translations and waypoint options
• new option to make timestamps also available inside the chart tooltip
• add a temporary fix to leaflet-i18n to allow empty translations
• removed some really old legacy stuff (overall code refactoring)