Unify FileUtils files

[danielgara]

I'm submitting a...

[ ] Regression (a behavior that used to work and stopped working in a new release)
[ ] Bug report  
[ ] Feature request
[ ] Documentation issue or request
[x] Improvement request
[ ] Support request => Please do not submit support request here

Current behavior

We have to merge and rename the FileUtils.java and the FileUtilsApache because both files provide similar functionalities.

Expected behavior

com.variamos.common\src\main\java\com\variamos\common\core\utilities\FileUtils.java
com.variamos.common\src\main\java\com\variamos\common\core\utilities\FileUtilsApache.java

Minimal reproduction of the problem with instructions

What is the motivation / use case for changing the behavior?

Environment

Variamos version:

Development branch

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