Make the names in +themeShowcaseExcludes case-insensitive

AppKit/Themes/Aristo/ThemeDescriptors.j

@@ -165,11 +165,12 @@ var themedButtonValues = nil,
 
     + (CPArray)themeShowcaseExcludes
     {
-        return ["themedAlert", "cornerView", "tableDataView"];
+        return ["themedAlert", "cornerview", "tableDataView"];
     }
 
     Note that to make it easier to do the right thing, the names in the array can begin with "themed" or not.
-    If the name does not begin with "themed", it is prepended and the first character uppercased if it is not there.
+    If the name does not begin with "themed", it is prepended. Name matching is case-insensitive, so you
+    don't have to worry about capitalization.
 
 
     SUBTHEMES

AppKit/Themes/BlendKit/BKThemeDescriptor.j

@@ -146,10 +146,12 @@ var ItemSizes               = { },
 
     for (; index < excludes.length; ++index)
     {
-        var name = excludes[index];
+        var name = excludes[index].toLowerCase();
 
         if (name && name.indexOf("themed") !== 0)
-            excludes[index] = "themed" + name.charAt(0).toUpperCase() + name.substr(1);
+            excludes[index] = "themed" + name;
+        else
+            excludes[index] = name;
     }
 
     for (index = 0; index < count; ++index)
@@ -167,7 +169,7 @@ var ItemSizes               = { },
             continue;
 
         var template = [[BKThemedObjectTemplate alloc] init],
-            excluded = [excludes containsObject:selector];
+            excluded = [excludes containsObject:selector.toLowerCase()];
 
         [template setValue:object forKey:@"themedObject"];
         [template setValue:BKLabelFromIdentifier(selector) forKey:@"label"];