Bug fixes

• PAReview fixes
• Added hook_help()

• Fix image selection
• Implement username/password based authentication
• Implement token based API authentication

## [8.x-2.0]
### Added
- This changelog file
- New configuration fields for handle new logic for generate RSA keys
- Functionality for generate new RSA keys for test and production environment
- Possibility to define identifier field for the customer
- Payment service production public RSA key
- Possibility to display summary for configuration
- Possibility to display shop public key
- Update hook for create new table
- Logic for prevent against process 2 payment responses at same time.

## [8.x-2.0]
### Added
- This changelog file
- New configuration fields for handle new logic for generate RSA keys
- Functionality for generate new RSA keys for test and production environment
- Possibility to define identifier field for the customer
- Payment service production public RSA key
- Possibility to display summary for configuration
- Possibility to display shop public key
- Update hook for create new table
- Logic for prevent against process 2 payment responses at same time.

• Lightning Core now supports attaching pictures to user accounts, and includes
  a Compact display which displays the user's picture and name, both optionally
  linked to the user's profile. (Issue #3026959)
• Lightning Core now includes a "Long (12-hour)" date format, which formats
  dates and times like "April 1, 2019 at 4:20 PM".
• Fixed a bug where Lightning's utility to convert descendant profiles to the
  Drupal 8.6-compatible format would fail if the active profile was itself a
  descendant profile. (Issue #2997990)

Fixing install config so that theme works with all install profiles and setting up the install page twig.