Support for UWP

[nirbil]

I'm trying to use this package in a UWP app, but it works only when building the project in Debug mode.
When building in Release mode the build fails with the following error:

ILT0038: 'WeCantSpell.Hunspell.WordEntryDetail' is a value type with a default constructor. Value types with default constructors are not currently supported. Consider using an explicit initialization function instead.

I believe that to resolve this error the default empty CTOR in the WordEntryDetail class needs to be removed.

[aarondandy]

I'm torn on if this would be a breaking change or not. It doesn't feel breaking to me as it would be compile time compatible even though not binary compatible. I don't think a change here would have any substantial impact to most users, outside of it being more compatible, so it's probably safe to make.