Fix 1362 Remove string literals in favor of nameof(), fix mixed tabs

ILSpy/AboutPage.cs

@@ -236,7 +236,7 @@ namespace ICSharpCode.ILSpy
 					if (automaticUpdateCheckEnabled != value) {
 						automaticUpdateCheckEnabled = value;
 						Save();
-						OnPropertyChanged("AutomaticUpdateCheckEnabled");
+						OnPropertyChanged(nameof(AutomaticUpdateCheckEnabled));
 					}
 				}
 			}
@@ -249,7 +249,7 @@ namespace ICSharpCode.ILSpy
 					if (lastSuccessfulUpdateCheck != value) {
 						lastSuccessfulUpdateCheck = value;
 						Save();
-						OnPropertyChanged("LastSuccessfulUpdateCheck");
+						OnPropertyChanged(nameof(LastSuccessfulUpdateCheck));
 					}
 				}
 			}

ILSpy/LoadedNugetPackage.cs

@@ -60,7 +60,7 @@ namespace ICSharpCode.ILSpy
 					SelectedEntries.Add(entry);
 				else
 					SelectedEntries.Remove(entry);
-				OnPropertyChanged("SelectedEntries");
+				OnPropertyChanged(nameof(SelectedEntries));
 			}
 		}