Improved: Improve error message page to support Theming

(OFBIZ-10753)

When OFBiz raise an error, the framework use a jsp page to display it.
I improved the error page generation to support also ftl template rendering and by this way extend the theme engine to support to overide it

On controler.xml we can now use :
    <errorpage>/error/error.jsp</errorpage>
or 
    <errorpage>component://common/webcommon/error/Error.ftl</errorpage> (default configuration)

On your theme you can add your own error page :
    <template> 
      ...
      <template-file widget=menu location=component://common-theme/template/macro/HtmlMenuMacroLibrary.ftl/>
    + <template-file widget=error location=component://common-theme/template/ErrorPage.ftl/>
    </template>

The component://common/webcommon/error/Error.ftl contains the logic theming connection and to simplify source code, all framework old error page (error.jsp) have been removed to centralize all on this new page.

Thanks to Marine Desmarchelier for the error page design

git-svn-id: https://svn.apache.org/repos/asf/ofbiz/ofbiz-framework/trunk@1856175 13f79535-47bb-0310-9956-ffa450edef68