Add support for Forerunner 165 (Music)

[KuabeM]

Adds support for the Forerunner 165 including the Music variant.

Tests and simulator seem to work fine with the time-based entries, there's just warning about the icon being scaled down.

However, these models don't react on the ENTER button for counter-based entries. Do you have an idea/hint where I should look at? The Forerunner 965 has the same issue.

I found out that pressing the Start/Stop aka Enter button calls onHide instead of onKey.

The docs also say that these two models should have a enter key.