1.210.2 Send methods

tray_icon ->initialise: image=image, tooltip=[char_array]*, popup=[popup]*

Show image in the tray. Fails with an error if the system has no tray.

tray_icon ->update:

Rebuild the menu from tray_icon<-popup after the popup changed.

tray_icon ->sdl_test_click: label=char_array

For testing only. Act as if the user selected the menu entry with this label. Fails if there is no such entry.