Reorganized some modules.
Added module Elm_multibuttonentry.
Added elm_multibuttonentry_add.
Added elm_multibuttonentry_entry_get.
Added elm_multibuttonentry_expanded_get/set.
Added elm_multibuttonentry_prepend/append.
Added elm_multibuttonentry_item_insert_before/after.
Added elm_multibuttonentry_items_get.
Added elm_multibuttonentry_first/last_item_get.
Added elm_multibuttonentry_selected_item_get.
Added elm_multibuttonentry_item_selected_set/get.
Added elm_multibuttonentry_clear.
Added elm_multibuttonentry_prev/next_get.
Added elm_multibuttonentry_editable_set/get.
Finished module Elm_multibuttonentry.
Reorganized modules.