Add tags support.

- add setting 'enable_tag_support';
- add setting 'pipeworks_item_tag_name_limit' (default 30)
- add functions for get and set tag into item stack.
- add tags cleanup while item dropped in a world or placed in some inventory.

Signed-off-by: Slava Zanko <slavazanko@gmail.com>

default_settings.lua

@@ -4,6 +4,7 @@ local prefix = "pipeworks_"
 
 local settings = {
 	enable_pipes = true,
+	enable_item_tags = true,
 	enable_lowpoly = false,
 	enable_autocrafter = true,
 	enable_deployer = true,