Actionabilize errors from incorrect settings files (PowerShell#1263)

* Annotatively research current state of exception handling surrounding settings file load invocation

* Throw a contextful terminating error if processing the argument of 'Invoke-ScriptAnalyzer -Settings' results in an exception

* Refine id and category of error for when processing value of `Invoke-ScriptAnalyzer -Settings` results in an exception

* Revert "Annotatively research current state of exception handling surrounding settings file load invocation"

This reverts commit 3bfd45b.

* Do not attempt id and category inference for the error to throw when processing the argument of `Invoke-ScriptAnalyzer -Settings` results in an exception

* Remove `using System.IO`

* Revert "Remove `using System.IO`"

This reverts commit 88ab1ec.

`using System.IO` is required in Engine\Settings.cs after all. The main
use is for pre-existing unqualified references to the type
InvalidDataException.

* Remove unused using after refactoring. Use more descriptive variable name and make error record arguments consistent with usage in other parts of the solution.

Engine/Commands/InvokeScriptAnalyzerCommand.cs

@@ -325,11 +325,13 @@ protected override void BeginProcessing()
                                                     ? rulePaths
                                                     : rulePaths.Concat(settingsCustomRulePath).ToArray();
             }
-            catch
+            catch (Exception exception)
             {
-                this.WriteWarning(String.Format(CultureInfo.CurrentCulture, Strings.SettingsNotParsable));
-                stopProcessing = true;
-                return;
+                this.ThrowTerminatingError(new ErrorRecord(
+                        exception,
+                        "SETTINGS_ERROR",
+                        ErrorCategory.InvalidData,
+                        this.settings));
             }
 
             ScriptAnalyzer.Instance.Initialize(
@@ -357,7 +359,7 @@ protected override void ProcessRecord()
             {
                 ProcessPath();
             }
-            
+
 #if !PSV3
             // TODO Support dependency resolution for analyzing script definitions
             if (saveDscDependency)