Merge branch 'cleanup_BackendModule' into 'master'

[TASK] Remove inline style for plugin preview

See merge request !11

Resources/Private/Templates/Youtube/Backend.html

 {namespace be=TYPO3\CMS\Backend\ViewHelpers}
 
-<style type="text/css">
-	.backend-preview-table > tbody > tr > th {
-		white-space: normal;
-	}
-</style>
+<f:asset.css identifier="sg_youtube-pluginpreview" href="EXT:sg_youtube/Resources/Public/StyleSheets/Backend/pluginpreview.css" />
 
 <be:link.editRecord uid="{uid}" table="tt_content">
 	<br/>
@@ -21,13 +17,13 @@
 	<f:if condition="{data.header}">
 		<h5>{data.header}</h5>
 	</f:if>
-	<table class="table table-striped table-bordered backend-preview-table">
+	<table class="table table-striped table-bordered sg_youtube-backend-preview-table">
 		<thead>
 			<tr>
-				<th scope="col" style="width: 50%">
+				<th scope="col">
 					<f:translate key="backendPreview.settings" extensionName="SgYoutube"/>
 				</th>
-				<th scope="col" style="width: 50%">
+				<th scope="col">
 					<f:translate key="backendPreview.values" extensionName="SgYoutube"/>
 				</th>
 			</tr>

Resources/Public/StyleSheets/Backend/pluginpreview.css

+.sg_youtube-backend-preview-table > tbody > tr > th {
+	white-space: normal;
+}
+
+.sg_youtube-backend-preview-table > thead > tr > th {
+	width: 50%;
+}