Plugin base class: Add method for creating titlebar buttons.
Plugin base: Item list: Move titlebar button creation code.
Plugin base: Terminal: Move button creation code.
Plugins: File list: Split main plugin file.
Plugins: File list: Created trash list tab.
Plugins: File list: Add get_root to trash provider.
Plugins: File list: Register trash list.
Plugins: File list: Fix trash directory monitoring.
Merge branch 'trash-support' into develop.

Conflicts:
	application/plugin_base/item_list.py
	application/plugins/file_list/local_monitor.py
	application/plugins/file_list/plugin.py