Not suitable for case sensitive file systems

[ArnUnderscoreUnderscore]

This code cannot be used on case sensitive file systems because the file path on the "import" function on a lot of files does not respect the proper case.

For example:

in src/controllers/files.ts at line 3:
import * as utils from '../utils/WopiUtil';

But the folder Utils start with a capital U. Running this on linux will give an exception "module not found WopiUtil".