feat(dpkg): license parser added

[DmitriyLewen]

Description

Debian based system hasn't requirement to write license information. But almost every package in Debian contains a copyright file in /usr/share/doc/<packagename>/copyright. More information here.

Added parser for copyright files and hook for adding licenses to dpkgs.

For parsing copyright files are used:

• License: * pattern.
• Parse common license url.
• licenseclassifier

[knqyf263]

@DmitriyLewen Can you resolve conflicts?