Rework api for better TypeScript support and overall simplicity

[Amareis]

• Replace custom shortcuts with some inline field which can be inferred by TS (and maybe remove disabling standard shortcuts at all)
  api.res({'some-field: {SHORTCUT: 'someField}}).someField.get()
• Remove res completely or make it working just like withRes
• Remove cloning all resources when id is passing - need prev item to be done first
• Maybe add some possibility to add types for api response (or runtime typechecking with existing libs)
• Think about Support for blob (or any other) response type #12

[vixalien]

I think using fetch is a plus