Add custom fr EPSG definition

* EPSG:2154: official national projection in FR
* EPSG27572: previous national projection (DEPRECATED) in FR
* EPSG:3947: local projection in the new official projection in FR

src/proj/epsg2154.js

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+goog.module('ngeo.proj.EPSG2154');
+goog.module.declareLegacyNamespace();
+
+goog.require('ol.proj');
+goog.require('ol.proj.proj4');
+
+if (typeof ol.proj.proj4.get() !== 'function' && typeof proj4 === 'function') {
+  ol.proj.setProj4(proj4);
+}
+
+if (typeof proj4 == 'function') {
+  const epsg2154def = [
+    '+proj=lcc',
+    '+lat_0=46.5',
+    '+lon_0=3',
+    '+lat_1=49',
+    '+lat_2=44',
+    '+x_0=700000',
+    '+y_0=6600000',
+    '+ellps=GRS80',
+    '+towgs84=0,0,0,0,0,0,0',
+    '+units=m',
+    '+no_defs'
+  ].join(' ');
+  const epsg2154extent = [-378305.81, 6093283.21, 1212610.74, 7186901.68];
+
+  ol.proj.proj4.defs('EPSG:2154', epsg2154def);
+  ol.proj.get('EPSG:2154').setExtent(epsg2154extent);
+}
+
+exports = 'EPSG:2154';

src/proj/epsg27572.js

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+goog.provide('ngeo.proj.EPSG27572');
+goog.module.declareLegacyNamespace();
+
+goog.require('ol.proj');
+goog.require('ol.proj.proj4');
+
+if (typeof ol.proj.proj4.get() !== 'function' && typeof proj4 === 'function') {
+  ol.proj.setProj4(proj4);
+}
+
+if (typeof proj4 == 'function') {
+  const epsg27572def = [
+    '+proj=lcc',
+    '+lat_0=46.8',
+    '+lon_0=0',
+    '+lat_1=46.8',
+    '+k_0=0.99987742',
+    '+x_0=600000',
+    '+y_0=2200000',
+    '+ellps=GRS80',
+    '+a=6378249.2',
+    '+b=6356515',
+    '+towgs84=-168,-60,320,0,0,0,0',
+    '+pm=paris',
+    '+units=m',
+    '+no_defs'
+  ].join(' ');
+  const epsg27572extent = [5168.43, 1730142.53,1013247.20, 2698564.20];
+
+  ol.proj.proj4.defs('EPSG:27572', epsg27572def);
+  ol.proj.get('EPSG:27572').setExtent(epsg27572extent);
+}
+
+exports = 'EPSG:27572';

src/proj/epsg3947.js

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+goog.provide('ngeo.proj.EPSG3947');
+goog.module.declareLegacyNamespace();
+
+goog.require('ol.proj');
+goog.require('ol.proj.proj4');
+
+if (typeof ol.proj.proj4.get() !== 'function' && typeof proj4 === 'function') {
+  ol.proj.setProj4(proj4);
+}
+
+if (typeof proj4 == 'function') {
+  const epsg3947def = [
+    '+proj=lcc',
+    '+lat_1=46.25',
+    '+lon_0=3',
+    '+lat_0=47',
+    '+lat_2=47.75',
+    '+x_0=1700000',
+    '+y_0=6200000',
+    '+ellps=GRS80',
+    '+towgs84=0,0,0,0,0,0,0',
+    '+units=m',
+    '+no_defs'
+  ].join(' ');
+  const epsg3947extent = [619993.48, 5637784.91, 2212663.72, 6731809.22];
+
+  ol.proj.proj4.defs('EPSG:3947', epsg3947def);
+  ol.proj.get('EPSG:3947').setExtent(epsg3947extent);
+}
+
+exports = 'EPSG:3947';