[Task] Install a Configuration package type with paket install

[eminfedar]

Description:
a local .paket file builded with Configuration type should be installable with this usage:

paket install paket-name_1.0.0.paket

Configuration type means "just copy the files inside the paket to their regarding paths in the system":

• {PaketRoot}/etc/X11/xorg.conf -> /etc/X11/xorg.conf
• {PaketRoot}/$USER_HOME/.config/monitors.xml -> /home/my-user/.config/monitors.xml (accessing the home folder of the current user by creating a "$USER_HOME" folder)
• {PaketRoot}/$ALL_USERS_HOMES/.config/monitors.xml -> [
  "/home/my-user/.config/monitors.xml",
  "/home/user2/.config/monitors.xml",
  "/home/another-user/.config/monitors.xml",
  ] (accessing the home folders of all users by creating a "$ALL_USERS_HOMES")

Details of how installation works: #10

Acceptance Criteria:

• Local paket can be installed successfully.
• Installed pakets are stored in /var folder.
• Upgrading or Downgrading for same package.
• SHA256SUM check before installation
• Files in $USER_HOME must be owned by the installer user, not root.
• Files in $ALL_USERS_HOMES must owned by each different user, not root or installer user.
• Tests are passing.
• Documentations on every struct, property and function is written with ///. There should be a description and a small example usage.

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Implementation Details:

// Some example code about how it will work