Fixed wrong Windows vibrance levels
Merge pull request #1 from returnWT/master

Some bugfixes and a few improvements from @returnWT
Add NullPointerException check in cleanUp-method
Add NvidiaSettingsWrapper

NvidiaSettingsWrapper wraps the NVIDIA vibrance values (0 - 63) to the
actual percentages displayed in the NVIDIA panel (50% - 100%) due to
inconsistency from NVIDIA.
Add single instance mutex; remove unused usings
Merge pull request #1 from juvlarN/master

update master