Fix raise property change bug on shade properties

Fixes

• #39 Shadow binding stopped working in 1.2.0 version (worked in 1.1.0)
• Crash: ShadowView.CreateBitmap: java.lang.nullpointerException #36

BitmapCache for Android Bitmaps

[Android] Performance

Add a bitmap cache on android so that for a given Color, BlurRadius and Size, only one instance of an Android Bitmap will be created and shared between all views.

Fix

• #21 Cannot access a disposed object. Object name: 'Android.Renderscripts.RenderScript'.
• #22 Improve Shadows performance on Android enhancement

Fix UWP builds

• UWP version is now built with any cpu and works with x86 and x64 platforms

Tizen support

Support for Tizen backend by Kangho Hur

• Add support for older Android
• Fixes BindingContext inheritance for shades
• Support for older windows sdk by Pavlo Lukianets
• Add x64 dll for UWP instead of x86

Fix android invalidation when updating Shade collection

Fix android invalidation when updating Shade collection

Fix memory leak on Android

Now calling _shadowView?.Dispose(); on renderer disposition.

First release of Sharpnado.Shadows

v1.0.0

fix readme tables