Refactor of code for "classic" part on Windows

The previous code is based on the assumption where we can use each
of local radio separatelly to discovery of remote devices. Windows
API allows to use a handle of separately local bluetooth adapter to
operate with its power, to start/stop detection of remote devices
through it and so on. But in this API there is no opportunity to
enumerate services and attributes of the given remote device via
the concrete local adapter.

Therefore now to discovery of remote devices are used all local
bluetooth adapters in system. Also, the power and the host modes
management now are belongs to all local adapters at once.

Tested on Windows 8 with the USB CSR8510 A10 adapter

Change-Id: I949b112158a575f5b563a78163c1e3990c952ada
Reviewed-by: Alex Blasche <alexander.blasche@theqtcompany.com>