[z2033] Improve OS detection for windows crash reporting

(based on commit 9646e30)

Signed-off-by: Nighoo <nighoo@overninethousand.de>

(cleaned version of 86d740e)

(based on commit [s1645] - cef1654)
[z2034] Don't check registry for game folder on windows, use relative "Data" dir, similar to linux.

Fixes annoyance when you have multiple wow clients and building vmaps fails for reason that extractor takes path from wrong client even though it is located inside the correct directory

Signed-off-by: stfx <stfx@hotmail.de>

(based on commit 6518789)

Signed-off-by: Nighoo <nighoo@overninethousand.de>

(based on commit [s1646] - 51aac0f)