IMaterialControl has to be public for NuGet, Csharp 6 and Net 4.6.1 Updates, Code Tidy Up

[michalkrzych]

Major:

• Updated .NET Framework version to 4.6.1
• Changed access modifier from default(internal) to public in IMaterialControl - when released as a NuGet package this will now allow developers to implement IMaterialControl and therefore create their own custom Material based controls.

Minor:

• Converted some property getters to expressions (C# 6.0 feature)
• Renamed private fields to start with an underscore (Naming Conventions)
• Added null propagation for event raises
• Updated Assembly versions for the MaterialSkin library and for the example app
• Removed unused references

[michalkrzych]

It would be fantastic if this was merged to the original repo @ https://github.com/IgnaceMaes/MaterialSkin and released as a NuGet package to allow people to actually implement custom User Controls implementing IMaterialControl

Tested thoroughly, everything seems just fine.

[lifehome]

Is it possible to use this patch/PR through NuGet, without the hassle of @IgnaceMaes accepting it?

[IgnaceMaes]

I merged the PR. Thank you for the contribution, a code cleanup was welcome!

Sorry for the late response, I'm not actively maintaining this repository anymore.

[marcelo2108]

Thank u!