Use relative imports everywhere

[synw]

My ide gets confused about the types sometimes when I read this library's code. I think this is because there are some mixed relative and absolute imports for internal files: sometimes it is relative and in some other places library files are imported with package:

I suggest that we move all internal imports to relative to avoid namespace confusions and have a better coding experience

[FZambia]

@mogol hello, German, what do you think?

[mogol]

Hey, I tend to use relative imports in the library, absolute was "auto" generated by ide, so it can be replaced without issues.

[synw]

I'm not familiar with auto generated code, got it. Thanks for the explanation. It feels strange to see for example in client.dart the transport.dart being imported twice: one as absolute and one as relative. But well that's the way it is