Compatibility update

Button:

Changed "testlos" to 0 for labels since the latest SA:MP update makes
server objects occlude text labels. Labels on items can be sometimes
inside the item model making the label invisible.

Fixed some incorrect streamer function calls for data manipulation.

extensions/Dispenser:

Added button and item indexes to dispensers to remove the need for loops
to search for linked entities.

Added button ID verification check.

Removed dependency on "MsgF" (missing function) replaced with standard
format + SendClientMessage.