Add FuncShort format alias

Create '%FuncShort' format alias, that would act like the '%Func' shortcut, but in case func name is long (e.g. functions from other packages have full names, including package), it would show only the part after the last dot ('.') in the name.

Example:

%Func -> 'somepackage.somestr.somefunc'
%FuncShort -> 'somefunc'