Fix node-sass not able to import variables

Some updates for RadListView page
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Simplify index

Export CSS variables to .ns-modal

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Fix the Slider

Remove the iOS back button in custom ActionBar examples
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Avoid the d.ts warning in app compile

Add .t-36 class
Fix the dark DateTimePicker missing icons
Fix a crash on orientation change
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Fix several compat issues

Fix TextField borders in both normal and compat
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Add typings

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