Added __soaap_fp to annotate func-pointer targets.

Added the annotation __soaap_fp(Funcs) that allows the annotating of function pointer targets. Currently, it works for local variables declarations (without initialiser). Funcs is a comma-separated list of functions. So you can do the following:

void foo();
void bar();

int main(int argc, char** argv) {
  void (*fp)() __soaap_fp(foo, bar);
  fp = foo;
  fp();
  return 0;
}

SOAAP will then add edges in the static callgraph from the call fp() to foo and bar.