F-Droid and FOSS

[czlucius]

Refactoring of codebase to be compatible to F-Droid, to have a build flavor that does not have proprietary libraries.
See #2, #5.

Challenges

• Detecting of data types(e.g. URL, E-mail) -> may create a library for that
  ZXing does not detect type of data, and returns it as a raw string. Code needs to be written to parse this data.
• Type Integers
• Generic classes so that general and foss can extend
• Others

Code will be pushed to the foss branch soon