Decode and encode a flexible polyline for/from HERE API

Decode and encode a flexible polyline with coordinates and possibly a 3rd dimension

This is the Matlab version of flexible polyline

(see: https://github.com/heremaps/flexible-polyline)

Example: the following coordinates

(50.10228, 8.69821), (50.10201, 8.69567), (50.10063, 8.69150), (50.09878, 8.68752)

are encoded with precision 5 as follows:

B F oz5xJ 67i1B 1B 7P zI ha xL 7Y

• The initial B is the header version (v.1)
• The second letter F is the header, corresponding to the precision 5 and no 3rd dimension set.
• The rest of the string are the encoded coordinates.