* Remove Bindable.
Fix Observable & ObservableArray tests
Fix formattedString text
Change implementation of Span, FormattedString & TextBase
properties valueChange called before native setter
* revetred formattedString tests asserts - formattedText update text property again
properties - when getting value we now use always property name instead of key (using key could return undefined for property that is set to its default value)
updated fontSize & fontInternal properties on all controls
fix font properties so that fontInternal is reset if the new font is the same as Font.default
* fix tslint errors
* Change image.android to use the new image.Cahce class from widgets.
* fix npm scripts
* npm tsc will compile all so no need for npm run dev-tsc-tests
* fix tslint error
* image-tests use memory only cache.
* fix exception in image.android
* Change image-tests so that Image won't be GC immediately.
* Change cacheMode to enum
