Fully implement file and directory actions

[jochenwezel]

Known missing or partial implementations

Implementation required for

• providers
  • WebDav
  • CenterDevice / Scopevisio Teamwork
• unit tests

Prio 1

• Copy file
• Move file
• Copy directory aka folder
• Copy directory aka collection
  • Attention: dependent on provider, collections might
    • not support copy/move and throw e.g. NotSupported exceptions
    • support renaming only
• Move directory aka folder
• Move directory aka collection
  • Attention: dependent on provider, collections might
    • not support copy/move and throw e.g. NotSupported exceptions
    • support renaming only

Prio 2

• Copy/move directory with overwrite=yes
  • Concept: what whall happen if the target directory already exists (partially)
  • Implementation