configurable "Template resource"

about on-off & order of priority,on site.ini(site_default.ini)

* Theme:          under themes/(theme)/templates/(file template)
* ThemeD3:        under themes/(theme)/templates/(trust based template)
* ThemeDefault:   under themes/(theme prefix)_default/templates/(file template)
* ThemeDefaultD3: under themes/(theme prefix)_default/templates/(trust based template)
* DbTplSet:       DB template of the selected tplset

Default setting is
[Smarty]
ResourceDiscoveryOrder=Theme,ThemeD3,ThemeDefault,ThemeDefaultD3,DbTplSet