- Before the transpilation, the required target dirs are automatically created, if they don't exist;
- Before the transpilation, the contents of the `base/` folder are copied to the `src/` and `res/` folders are copied to the project's corresponding folders; this means that the base libraries and base resources don't need to be added to the project during its creation;
- Before the transpilation, if the `project/` folder inside the project contains child `src/`  and/or `res/` subfolders, those will be copied unmodified to the target `src/` and `res/` folders.

Merge pull request #75 from haroldo-ok/copy-sources
This fixes #50