Merged `fixes/76-trim-whitespace` into `avalonia` branch (https://github.com/cwensley/Portable.Xaml/pull/77). Fixes whitespace trimming in Xaml reader. Fixes #1275
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-Subproject commit d50ae8335eb50d4b9606de6f5fa1cbbc78bfd72f
+Subproject commit c0664014455392ac221a765e66f9837704339b6f