manaplus: update to 2.1.3.17

2021-03-17 New release 2.1.3.17
fix: clear background under too small maps.
fix: porting fix for mumblemanager from NetBSD.
fix: alternate ip address for char and map servers.
fix: back to login button in world selection window.
fix: foreground theme color in popups.
add: separate auto move sync distance for legacy servers.
add: support for items with id bigger than 65535.
add: chat command /trimmemory for force trim freed memory.
add: switch game console support in source (by cpasjuste).
update: golden delicious theme.
change: protocol version changed to 26.
change: installed desktop icon type to svg (*nix).

(nia)