Deprecate $:/tags/stylesheet in favour of $:/tags/Stylesheet

A warning message appears at the top of the story river if any
`$:/tags/stylesheet` tags are found.

Fixing the first half of #824

plugins/tiddlywiki/codemirror/files/tiddlywiki.files

@@ -12,14 +12,14 @@
 			"fields": {
 				"type": "text/css",
 				"title": "$:/plugins/tiddlywiki/codemirror/lib/codemirror.css",
-				"tags": "[[$:/tags/stylesheet]]"
+				"tags": "[[$:/tags/Stylesheet]]"
 			}
 		},{
 			"file": "addon/dialog/dialog.css",
 			"fields": {
 				"type": "text/css",
 				"title": "$:/plugins/tiddlywiki/codemirror/addon/dialog/dialog.css",
-				"tags": "[[$:/tags/stylesheet]]"
+				"tags": "[[$:/tags/Stylesheet]]"
 			}
 		},{
 			"file": "addon/dialog/dialog.js",

plugins/tiddlywiki/codemirror/styles.tid

@@ -1,5 +1,5 @@
 title: $:/plugins/tiddlywiki/codemirror/styles
-tags: [[$:/tags/stylesheet]]
+tags: [[$:/tags/Stylesheet]]
 
 /* Make the editor resize to fit its content */
 

plugins/tiddlywiki/d3/base.tid

@@ -1,5 +1,5 @@
 title: $:/plugins/tiddlywiki/d3/base.tid
-tags: [[$:/tags/stylesheet]]
+tags: [[$:/tags/Stylesheet]]
 
 \rules only filteredtranscludeinline transcludeinline macrodef macrocallinline
 

plugins/tiddlywiki/github-fork-ribbon/styles.tid

@@ -1,5 +1,5 @@
 title: $:/plugins/tiddlywiki/github-fork-ribbon/styles
-tags: [[$:/tags/stylesheet]]
+tags: [[$:/tags/Stylesheet]]
 
 /* Left will inherit from right (so we don't need to duplicate code */
 .github-fork-ribbon {

plugins/tiddlywiki/highlight/files/tiddlywiki.files

@@ -15,7 +15,7 @@
 			"fields": {
 				"type": "text/css",
 				"title": "$:/plugins/tiddlywiki/highlight/highlight.css",
-				"tags": "[[$:/tags/stylesheet]]"
+				"tags": "[[$:/tags/Stylesheet]]"
 			}
 		}
 	]

plugins/tiddlywiki/highlight/styles.tid

@@ -1,5 +1,5 @@
 title: $:/plugins/tiddlywiki/highlight/styles
-tags: [[$:/tags/stylesheet]]
+tags: [[$:/tags/Stylesheet]]
 
 
 /* Tomorrow Night Theme */

plugins/tiddlywiki/jasmine/files/tiddlywiki.files

@@ -13,7 +13,7 @@
 			"fields": {
 				"type": "text/css",
 				"title": "$:/plugins/tiddlywiki/jasmine/jasmine.css",
-				"tags": "[[$:/tags/stylesheet]]"
+				"tags": "[[$:/tags/Stylesheet]]"
 			}
 		},{
 			"file": "jasmine.js",

plugins/tiddlywiki/tw2parser/image-css.tid

@@ -1,4 +1,4 @@
-tags: $:/tags/stylesheet
+tags: $:/tags/Stylesheet
 title: $:/plugins/tiddlywiki/tw2parser/image-css
 type: text/plain
 

plugins/tiddlywiki/upgrade/styles.tid

@@ -1,5 +1,5 @@
 title: $:/plugins/tiddlywiki/upgrade/styles
-tags: $:/tags/stylesheet
+tags: $:/tags/Stylesheet
 
 .tc-upgrade-wizard-wrapper {
 	width: 100%;