Fixes inconsistency in component partial folder names

This is a breaking change that will require further attention - refs #1854

Eg: myComponent, the default component partial would use lower case folders
- /plugins/acme/test/components/mycomponent/default.htm

The theme component partial override would use case sensitive folders
- /themes/foobar/partials/myComponent/default.htm

This is fixed as
- /themes/foobar/partials/mycomponent/default.htm

Minor code fix to ModelBehavior class

modules/cms/classes/Controller.php

@@ -818,7 +818,7 @@ class Controller
              * Check if the theme has an override
              */
             if (strpos($partialName, '/') === false) {
-                $overrideName = $componentObj->alias . '/' . $partialName;
+                $overrideName = strtolower($componentObj->alias) . '/' . $partialName;
                 $partial = Partial::loadCached($this->theme, $overrideName);
             }
 

modules/system/classes/ModelBehavior.php

@@ -28,8 +28,7 @@ class ModelBehavior extends ModelBehaviorBase
         /*
          * Validate model properties
          */
-        foreach ($this->requiredProperties as $property)
-        {
+        foreach ($this->requiredProperties as $property) {
             if (!isset($model->{$property})) {
                 throw new ApplicationException(Lang::get('system::lang.behavior.missing_property', [
                     'class' => get_class($model),