Issue #2931656 by pvsureshmca, riddhi.addweb: Convert module to use short array syntax (new coding standard)

Issue #2931980 by adubovskoy, andypost: Uncaught PHP Exception Drupal\Core\Config\ImmutableConfigException: "Can not set values on immutable configuration fz152.forms:forms

General review

Issue #2927039 by andypost, prafull.addweb: Add configuration link to modules page for contact integration

- Document plugin code
- Allow plugins to use string stranslation
- Enable DI for settings form

- Documents plugin manage and interfaces
- Privacy, General settings pages
- Proper injection of config factory

Created Fz152 Plugin system. Refactored code and file names. Started migration default forms settings to plugins sytem. Work in progress.

- Config are now in separate files.
- Each default config is multilangual (can have different values for different languages). To access this feature you need to enable 'Config Translation' from core'
- Changed form submissions for correct config savig. https://www.drupal.org/node/2407153
- Defined schema for translatable cofnigs.

- Integration with webform module.
- Fixed wrong installation file path.

- Full support for entityform entegration.
- Added uninstallation hooks for clearing data after modules

- Changed hook_fz152_info() to more flexible.
- Changed code according to hook changes.
- Privacy page settings is now on personal setting page.
- Checkbox text is now 'text' type, due to string char limitations.

- Added integration with variables module.
- Added support for multilangual values of settings.
- Added default settings for module.
- Added page generation with privacy policy content.
- Added form altering and adding to them checkboxes.
- Added support for basic form_ids with checkbox weight.
- Added hooks for extendability and flexibility.
- Added basic implementation for forms using hooks and patterns.