infrastructure code for elevation profile tool; click button to draw a line which sends a LINESTRING to the server and draws a graph of json response
tmp graph_data to display graph with real data
changed elevation profile icon + on click behaviour
set maxVertices: 2 for handleroptions so only straight lines can be selected for profiles; removed bounds from vars that get send to server
proof of concept elevation profile call flask app listening for geom and srs and draw returned array of distance and heights
fixed displayInLayerSwitcher bug; features get destroyed when deselecting profile tool