Add Line Numbers

[fundamental]

When building with -g clang produces information which should be mappable back to line numbers and whatnot.

• Add line number/file information to nodes in yaml printout (it might be worth a format redesign to avoid parsing hell)
• Add line number information to callgraph node and callgraph edge information
• Preserve information about the relevant calls in the deduction phase
• Add line number/file information to the output errors and the deduction change

[fundamental]

Now that LLVM 4.0 builds are enabled it should be possible to more thoroughly test the line number branch