Fix blocking due to very slow regex execution in "parseFunction"

[hansec]

With long function names the current regex is very slow, effectively blocking symbols from being displayed in the outline view. Below is a minimal example based on Fortran Intellisense issue #19.

subroutine longsubroutinenamesuchasthisname(pos1,pos2,pos3) ! function
integer, intent(in) :: pos1,pos2,pos3,longvarname
end subroutine