[TEST REQUEST] Windows Bluetooth LE build

[Lubomir I. Ivanov]

looks like the recent libdc + BLE refactor in Subsurface fixed the
issues i was having downloading from the OSTC+ on Windows, with my
custom Qt build.
so it wasn't an issue in the Qt stack.

thanks goes to Linus, because i was stuck on this not being able to
figure out what's going on for a long time...

log for proof:
https://pastebin.com/7DHZU855

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link for testing my latest Subsurface test build for BLE on Win32:
https://www.dropbox.com/s/zslq3ughx9ciehj/_deploy_win32_ble.zip?dl=0

instructions:

prerequisites:
- minimum Windows version for this is 8.1
- make sure that Windows has detected and paired with your DC

steps:
- extract the _deploy_win32_ble.zip ZIP in a folder somewhere
- navigate to the folder with Explorer and start _run.cmd
- a console window should open and next to it the Subsurface window
- start your BLE dive-computer and make it ready for downloading of dives
- in Subsurface goto Import -> Download from divecomputer
- select the following options (and pick paths):
     [x] Save libdivecomputer dumpfile
     [x] Save libdivecomputer logfile
- select the following option:
     [x] Choose bluetooth download mode
- a dialog should open. select "Force LE" for mode, and click "Scan".
- your device should appear in the list. select it and click "Save"
- the "Device or mount point" field should now show your DC.
- click "Download".

report back logs and dump files if it doesn't work for you.

lubomir
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