Remove included streams.h to avoid conflicts with empty_streams.h

[jfpoilpret]

In FastArduino library, several header files explicitly #include "streams.h" just to define specific operator<<() on types defined in these files. This has a spurious impact on programs that:

• include one of these header files, directly or indirectly
• include empty_streams.h

Since FastArduino allows end developers to use streams.h or empty_streams.h in their programs, their choice shall not prevent using some FastArduino features.

Thus any non-mandatory #include "streams.h" should be removed, and specific operator<<() shall be defined elsewhere or differently to fit either streams kind.

Concerned files are:

• future.h
• i2c_handler_common.h
• i2c_status.h
• i2c.h
• vl53l0x_types.h

There are other headers including streams.h but they definitely need actual streams, so no change is needed for them.

[jfpoilpret]

Fix since PR #105