Blender Git Loki

Select Menu patch, as provided by Campbell Barton, but recoded to make it
a nice separate function, reducing code size to half and keeping it
readable code :)

Functionality; while holding ALT on a mouse-select, a menu will pop up
displaying all Objects that can be potentially selected. Maximum 22
objects will be displayed. When only one object is found it selects it
automatically, otherwise it allows the user to select/activate by the
menu.