Use floats in ElevationProfileSegment.

This saves around 1.8% of memory.
Add toString() to Alert (ie note) class.
Move notes out of PlainStreetEdge.

Use a dedicated index.
Format NotePicker code.
Use matcher for note creation.

This make all notes creation the same (toll, wheelchair, general notes).
I18n for wheelchair notes are disabled for now.
Add i18n capabilities to OSM TemplateLibrary.
Add unit test for TemplateLibrary.
I18N alert notes.
Remove unused import warning.
Intern identical note/matcher in same instance.

Add code comment.
Remove unused public method.