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Add dependency injection container

This patch introduces a dependency injection container for the PHP bug
tracker application. Container deals with the creation of all service
classe

Add dependency injection container

This patch introduces a dependency injection container for the PHP bug
tracker application. Container deals with the creation of all service
classes and additionally provides retrieving of configuration parameters.
Service classes are used everywhere in the app - from accessing database
to uploading files. Configuration parameters include infrastructure
configuration (database credentials...) and application level
configuration (directories locations...).

Container is compatible with the PSR-11 container interface defined
so it is simple to quickly understand its usage. Advanced features
such as autowiring are not included in this phase.

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Refactor bugs_get_bug() to repository

Move fetching bug comments to a repository class

Changes:
- This moves fetching bug comments to a dedicated repository class
- It uses vanilla PDO as current direction of the databas

Move fetching bug comments to a repository class

Changes:
- This moves fetching bug comments to a dedicated repository class
- It uses vanilla PDO as current direction of the database usage
is applied in this app.
- When bug_id is set to preview types issues occur due to int type
hint. Should be refactored more in the future commits.

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- The end of an era - switch "Bogus" to "Not a bug" by popular demand
- Switch back to master
- Add site_method to make it easier to install on non-ssl test sites

- Added check for private bug

load/link everything from https

- Rename to avoid unnecessary symlink