Global imports and configuration rework

[Igmat]

Description of Change

While working on #41, I've found that problem isn't in compiler options of typescript but in its include option which adds all global namespaces (e.g. reflect-metadata) from included files to compiler context. So solution for this issue is adding an option to include some files/modules/packages to context of each test.
This new option has shown some existing problems with baset configuration, so a little refactoring of this part also included here.

Pull Request check-list

• Does the linter pass?
• If this change fixes a bug (or a performance problem), is a regression
  test (or a benchmark) included?
• Is a documentation update included (if this change modifies
  existing APIs, or introduces new ones)?