* used wstring in FilePath constructor where easily possible
* added FilePath concatenate method that accepts string parameter
* implemented using only wstring in MessageStatus
* used wstring in config
* improves indexing performance by roughly 5%
* switched to use uniqu_ptr for boost path to get rid of including boost in header
* added different methods to change the current FilePath or to make a copy and change that one
* used these methods appropriately throughout the code base
* removed exists() method from FileSystem because it is already contained in FilePath
* added const in some places
* Added non-commercial use option to enter license window
* Show enter license window on first start and force license selection
* Added ApplicationSettings migration that removed private/academic license and switches user to non-commercial mode
* Added commandline option to choose non-commercial use and provide better hints to license selection
* Removed trial mode
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