Create mode of operation where instead of functions file, just trace the function calls without param types

[grantseltzer]

We can just inspect the symbol table and attach uprobes to every function in a list of a specified packages (default: just main), and have it print out just when the function is called. If #8 is confirmed then this would just be the default mode of operation.

Functions files might still be useful for people who want fine grained control of what's traced

[grantseltzer]

Closed by #38