Modified evaluation as follows:
- Instead of relying on source code to be compiled ahead of time, source
code is compiled when needed and thus it is now sufficient to supply a
*.drs file for the runtime. Then, the runtime will figure out whether it
is necessary to compile the drs file or not:
  -if there is an existing drr file, then that is loaded
    - if the source modified info in the drr file matches the drs file,
then the drs file is loaded
    - otherwise, the drs file is compiled
  - other, the drs file is compiled

Signed-off-by: Jakob Brandsborg Ehmsen <jakobehmsen.github@gmail.com>