Port to new Redox_Users

Sorry for the git mess. Cargo.lock should be updated now

Also cleaned up some syntax where the new API is used.

 Update calendar and file_manager to use new CSS in orbtk 

Fix build with toolchain

Fix Terrible Logic Mistakes

Change use of redox_users; update Cargo.lock

Calendar

Added run instructions

- replace userutils with redox_users.

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Migrate to redox_users

background: Fix error message

Add file and folder create dialog

Fix unused extern crates