Upgrade dependencies

[bockstaller]

This PR upgrades all dependencies. This is done in steps to show my work and should probably be squashed before merging to keep the history clean.

• switches ts-jest compiler from ttypescript to ts-patch due to https://github.com/cevek/ttypescript/issues/140
• switches to typescripts getDecorators() method as .decorator is removed
• uses new declare global syntax https://www.typescriptlang.org/docs/handbook/declaration-files/templates/global-modifying-module-d-ts.html
• uses typescript factory.getParameterDeclaration
• fixes types in tests
• auto fixes lint errors

This PR keeps using the legacy decorators.