Makes it easier to reuse the demo platform glue for other projects.
Especially game loops or platforms where rendering is set up in a
different order.
TB API change: Removed language file path from tb_core_init.
g_tb_lng->Load should be called manually after tb_core_init instead.
-Added test where TBSelectDropDown is using the custom item source.
-Fixed typo.
-Test custom filter.
-New layout & Inflate the item widget from resource.
-Sort list (shows a bug when deleting items)
