Turn all TemplateData .css files into .less files

This patch intentionally doesn't do anything else. Later patches will
make use of LESS features.

Change-Id: I7ce7fdba12aa9f5fb49a752706b83f831632bed6

Gruntfile.js

@@ -26,7 +26,7 @@ module.exports = function ( grunt ) {
 		},
 		stylelint: {
 			all: [
-				'modules/**/*.css'
+				'modules/**/*.{css,less}'
 			]
 		},
 		banana: {

extension.json

@@ -41,7 +41,7 @@
 		"ext.templateData": {
 			"localBasePath": "modules/ext.templateData",
 			"remoteExtPath": "TemplateData/modules/ext.templateData",
-			"styles": "templateData.css"
+			"styles": "templateData.less"
 		},
 		"ext.templateDataGenerator.editPage": {
 			"localBasePath": "modules/ext.templateDataGenerator.editPage",
@@ -65,12 +65,12 @@
 		"ext.templateDataGenerator.editTemplatePage.loading": {
 			"localBasePath": "modules/ext.templateDataGenerator.editTemplatePage",
 			"remoteExtPath": "TemplateData/modules/ext.templateDataGenerator.editTemplatePage",
-			"styles": "templateDataGenerator.placeholder.css"
+			"styles": "templateDataGenerator.placeholder.less"
 		},
 		"ext.templateDataGenerator.editTemplatePage": {
 			"localBasePath": "modules/ext.templateDataGenerator.editTemplatePage",
 			"remoteExtPath": "TemplateData/modules/ext.templateDataGenerator.editTemplatePage",
-			"styles": "templateDataGenerator.ui.css",
+			"styles": "templateDataGenerator.ui.less",
 			"packageFiles": [
 				"init.js",
 				"widgets/AutosizeTextInputWidget.js",