Projection parameter in lowercase not handled

[elias75015]

Your Environment

Ubuntu 18.04
Chrome 77.0.3865.120

Context

iTowns only accept "EPSG:3857" and "EPSG:4326" as projection parameter when adding a layer.

Steps to Reproduce (for bugs)

1. add a wmts layer with "EPSG:3857" projection
2. see the result

Expected Behavior

No error, the layer is added

Actual Behavior

Error, the map is broken

Possible Cause/Fix/Solution

Accept the projection parameter in lowercase ("epsg:4326" and "epsg:3857")

[gchoqueux]

thank you, for revealing this issue.