Werk #8348: Changes in custom files are now detected and tell the user to rebake the agents

It is possible to include custom files with the agent bakery for deploying the files with the agent. This is currently only available for windows systems.

Changes to these files were not detected by the agent bakery. The user had to modify other rules or enforce that the agents are rebuilt. This has been changed now. All files included with an agent are monitored for changed contents now.

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