Implemented opening/saving themes

Filtration.Common/Properties/AssemblyInfo.cs

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+using System.Reflection;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+
+// General Information about an assembly is controlled through the following 
+// set of attributes. Change these attribute values to modify the information
+// associated with an assembly.
+[assembly: AssemblyTitle("Filtration.Common")]
+[assembly: AssemblyDescription("")]
+[assembly: AssemblyConfiguration("")]
+[assembly: AssemblyCompany("Microsoft")]
+[assembly: AssemblyProduct("Filtration.Common")]
+[assembly: AssemblyCopyright("Copyright © Microsoft 2015")]
+[assembly: AssemblyTrademark("")]
+[assembly: AssemblyCulture("")]
+
+// Setting ComVisible to false makes the types in this assembly not visible 
+// to COM components.  If you need to access a type in this assembly from 
+// COM, set the ComVisible attribute to true on that type.
+[assembly: ComVisible(false)]
+
+// The following GUID is for the ID of the typelib if this project is exposed to COM
+[assembly: Guid("36a40512-35b4-489c-8e20-f431b9e92dc1")]
+
+// Version information for an assembly consists of the following four values:
+//
+//      Major Version
+//      Minor Version 
+//      Build Number
+//      Revision
+//
+// You can specify all the values or you can default the Build and Revision Numbers 
+// by using the '*' as shown below:
+// [assembly: AssemblyVersion("1.0.*")]
+[assembly: AssemblyVersion("1.0.0.0")]
+[assembly: AssemblyFileVersion("1.0.0.0")]
+
+[assembly: InternalsVisibleTo("Filtration.Tests")]
+[assembly: InternalsVisibleTo("Filtration.Common.Tests")]
+[assembly: InternalsVisibleTo("DynamicProxyGenAssembly2")]

Filtration.Common/Services/FileSystemService.cs

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+using System;
+using System.IO;
+
+namespace Filtration.Common.Services
+{
+    public interface IFileSystemService
+    {
+        string ReadFileAsString(string filePath);
+        void WriteFileFromString(string filePath, string inputString);
+        bool DirectoryExists(string directoryPath);
+        string GetUserProfilePath();
+    }
+
+    internal class FileSystemService : IFileSystemService
+    {
+        public string ReadFileAsString(string filePath)
+        {
+            return File.ReadAllText(filePath);
+        }
+
+        public void WriteFileFromString(string filePath, string inputString)
+        {
+            File.WriteAllText(filePath, inputString);
+        }
+
+        public bool DirectoryExists(string directoryPath)
+        {
+            return Directory.Exists(directoryPath);
+        }
+
+        public string GetUserProfilePath()
+        {
+            return Environment.GetFolderPath(Environment.SpecialFolder.UserProfile);
+        }
+    }
+}

Filtration.Common/ViewModels/FiltrationViewModelBase.cs

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+using System.Runtime.CompilerServices;
+using Filtration.ObjectModel.Annotations;
+using GalaSoft.MvvmLight;
+
+namespace Filtration.Common.ViewModels
+{
+    public class FiltrationViewModelBase : ViewModelBase
+    {
+        /// This gives us the ReSharper option to transform an autoproperty into a property with change notification
+        /// Also leverages .net 4.5 callermembername attribute
+        [NotifyPropertyChangedInvocator]
+        protected override void RaisePropertyChanged([CallerMemberName]string property = "")
+        {
+            base.RaisePropertyChanged(property);
+        }
+    }
+}

Filtration.Common/ViewModels/PaneViewModel.cs

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+using System.Windows.Media;
+
+namespace Filtration.Common.ViewModels
+{
+    public class PaneViewModel : FiltrationViewModelBase
+    {
+        private string _title;
+        public string Title
+        {
+            get { return _title; }
+            set
+            {
+                if (_title != value)
+                {
+                    _title = value;
+                    RaisePropertyChanged();
+                }
+            }
+        }
+
+        public ImageSource IconSource { get; protected set; }
+
+        private string _contentId;
+        public string ContentId
+        {
+            get { return _contentId; }
+            set
+            {
+                if (_contentId != value)
+                {
+                    _contentId = value;
+                    RaisePropertyChanged();
+                }
+            }
+        }
+        
+        private bool _isSelected;
+        public bool IsSelected
+        {
+            get { return _isSelected; }
+            set
+            {
+                if (_isSelected != value)
+                {
+                    _isSelected = value;
+                    RaisePropertyChanged();
+                }
+            }
+        }
+        
+        private bool _isActive;
+        public bool IsActive
+        {
+            get { return _isActive; }
+            set
+            {
+                if (_isActive != value)
+                {
+                    _isActive = value;
+                    RaisePropertyChanged();
+                }
+            }
+        }
+    }
+}