Image converter tool (#139)
* Added Image Converter basic structure
Added Image Converter View, ViewModel, Provider and related changes
* Fixed wrong reference
Fixed wrong reference in ImageConversionWorkItem.cs Strings variable
* Added encoder and decoder logic
Added encoder and decoder logic using Windows.Graphics.Imaging
* Added Save All and Save only one conversion item features
* Finished save feature
* Fixed JPEG and JPEG XR BitmapEncoder options issue
* Fixed merge issues
* Added tool in README.md
* Minor fixes to solve PR comments
* Added tool in PowerShell README.md documentation
* Included .xaml view under Graphic folder
* Added ImageConverter.resw in every language
* Extracted code to StorageFileHelper.cs and added .resw to .csproj
* Removed unnecessary lines
* Used fire-and-forget approach in ImageConversionWorkItem constructor
* Fix to solve new comments
* Update ImageConverterToolViewModel renaming QueueNewConversionWorkItem method
* Allowed only PNG, JPEG and BMP formats
* Added await TaskScheduler.Default; in async methods
* New approach ExecuteSaveAllCommandAsync method (ImageConverterToolViewModel)
This will avoid use UI (foreground) thread to perform the image save process when using Save All button
* Added error handler InfoBar
* Set IsInfoBarOpen variable to false when closing InfoBar UI element
* Modify UI elements in UI thread instead of in worker threads
* Logged exceptions catched in ViewModel
* ImageConversionWorkItem implemented IDisposable and fixed bug when saving all items
* Logged error in ViewModel
* Used only StorageFile in ImageConversionWorkItem.cs and decode image when saving
* DecodeImageAsync will be executed in UI thread if saved only 1 image or in background threads if save multiple images
* Performance fixes and code improvements
* Removed unused property
