Allow renderers and renderables in a namespace to be auto loaded.

For new plugins at least - it would be nice to be able to put the renderer in a class in the plugins classes folder and use a namespace instead of the full frankenstyle name for the class. Same goes for renderables - they currently can't be put in a namespace.

Current situation:

Currently we look for renderer class like this (depending on the renderer_factory):

standard_renderer_factory

(get_renderer called with $component = 'mod_assign', $subtype = 'custom', $target='ajax')

Search list:

mod_assign_custom_renderer_ajax

mod_assign_custom_renderer

theme_overridden_renderer_factory

(get_renderer called with $component = 'mod_assign', $subtype = 'custom', $target='ajax' and theme_clean inherits from theme_bootstrapbase)

Search list:

theme_clean_mod_assign_custom_renderer_ajax

theme_bootstrapbase_mod_assign_custom_renderer_ajax

mod_assign_custom_renderer_ajax

theme_clean_mod_assign_custom_renderer

theme_bootstrapbase_mod_assign_custom_renderer

mod_assign_custom_renderer

renderables

And currently renderables cannot existing in a namespace, because the class name is used in the render_xxx method of the renderer.

After this patch:

standard_renderer_factory

(get_renderer called with $component = 'mod_assign', $subtype = 'custom', $target='ajax')

Search list:

\\mod_assign\\output\\custom_renderer_ajax

\\mod_assign\\output\\custom_renderer

mod_assign_custom_renderer_ajax

mod_assign_custom_renderer

theme_overridden_renderer_factory

(get_renderer called with $component = 'mod_assign', $subtype = 'custom', $target='ajax' and theme_clean inherits from theme_bootstrapbase)

Search list:

theme_clean\\output\\mod_assign\\custom_renderer_ajax

theme_clean_mod_assign_custom_renderer_ajax

theme_bootstrapbase\\output\\mod_assign\\custom_renderer_ajax

theme_bootstrapbase_mod_assign_custom_renderer_ajax

\\mod_assign\\output\\custom_renderer_ajax

mod_assign_custom_renderer_ajax

theme_clean\\output\\mod_assign\\custom_renderer

theme_clean_mod_assign_custom_renderer

theme_bootstrapbase\\output\\mod_assign\\custom_renderer

theme_bootstrapbase_mod_assign_custom_renderer

\\mod_assign\\output\\custom_renderer

mod_assign_custom_renderer

renderables

renderables can exist in the (e.g.) \mod_assign\output\test_renderable class, and the render method on the renderer will be "render_test" (_renderable is removed).