Hila pre-processor tool

The hilapp tool is not something that generally the user should worry about, but to get a better understanding of what happens under the hood we offer the following explanation.

In short, the workflow with the hilapp tool works in the following manner:

1. Write c++ code using the syntax and datatypes described above
2. Use the hilapp executable to convert this code into .cpt code

bin/hilapp path/to/program.cpp

This will create a cpt file which is essentially standard C++.

1. Compile the new .cpt code into the final executable

The cpt can be compiled with any c++ compiler, but must be linked against the headers and c++ files in the plumbing directory.