feat(WMS): call GetCapabilities during layer preprocessing

WMS provider call get capabilities and set or check the following information:
- projection
- extent
- format

BREAKING CHANGE:

WMS layer will now query getCapabilities. If you want to disable this
behaviour (because you already provide all the informations in the json
object), you need to set layer.disableGetCap to true.

examples/planar_vector.js

@@ -28,6 +28,7 @@ view.addLayer({
     networkOptions: { crossOrigin: 'anonymous' },
     type: 'color',
     protocol: 'wms',
+    disableGetCap: true, // their getCap is too slow
     version: '1.3.0',
     id: 'wms_imagery',
     name: 'Ortho2009_vue_ensemble_16cm_CC46',
@@ -41,6 +42,7 @@ view.addLayer({
     url: 'https://download.data.grandlyon.com/wms/grandlyon',
     type: 'elevation',
     protocol: 'wms',
+    disableGetCap: true, // their getCap is too slow
     networkOptions: { crossOrigin: 'anonymous' },
     version: '1.3.0',
     id: 'wms_elevation',

examples/wfs.js

@@ -31,6 +31,7 @@ view.addLayer({
     networkOptions: { crossOrigin: 'anonymous' },
     type: 'color',
     protocol: 'wms',
+    disableGetCap: true, // their getCap call is too slow
     version: '1.3.0',
     id: 'wms_imagery',
     name: 'Ortho2009_vue_ensemble_16cm_CC46',