#11 fix SASL login failures with non-ASCII passwords

- Normalize SCRAM passwords with RFC 4013 SASLprep before the
  challenge response, so they match SASLprep-compliant servers
  (Martin hashes raw UTF-8) and PLAIN still sends the password
  untouched.
- Capture the raw <failure/> condition with LumaSaslFailureModule and
  map SASL errors to actionable Russian messages instead of the
  cryptic OS-localized "Martin.SaslError, error 5".
- Cover SASLprep and failure message mapping with unit tests and new
  verify.sh invariants.

Luma.xcodeproj/xcshareddata/xcschemes/Luma.xcscheme

@@ -1,10 +1,11 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Scheme
-   LastUpgradeVersion = "2660"
-   version = "1.3">
+   LastUpgradeVersion = "1600"
+   version = "1.7">
    <BuildAction
       parallelizeBuildables = "YES"
-      buildImplicitDependencies = "YES">
+      buildImplicitDependencies = "YES"
+      runPostActionsOnFailure = "NO">
       <BuildActionEntries>
          <BuildActionEntry
             buildForTesting = "YES"
@@ -40,7 +41,8 @@
       buildConfiguration = "Debug"
       selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
       selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
-      shouldUseLaunchSchemeArgsEnv = "YES">
+      shouldUseLaunchSchemeArgsEnv = "YES"
+      onlyGenerateCoverageForSpecifiedTargets = "NO">
       <MacroExpansion>
          <BuildableReference
             BuildableIdentifier = "primary"
@@ -63,6 +65,8 @@
             </BuildableReference>
          </TestableReference>
       </Testables>
+      <CommandLineArguments>
+      </CommandLineArguments>
    </TestAction>
    <LaunchAction
       buildConfiguration = "Debug"
@@ -84,6 +88,8 @@
             ReferencedContainer = "container:Luma.xcodeproj">
          </BuildableReference>
       </BuildableProductRunnable>
+      <CommandLineArguments>
+      </CommandLineArguments>
    </LaunchAction>
    <ProfileAction
       buildConfiguration = "Release"

Luma.xcodeproj/xcshareddata/xcschemes/LumaMac.xcscheme

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Scheme
-   LastUpgradeVersion = "2660"
+   LastUpgradeVersion = "1600"
    version = "1.3">
    <BuildAction
       parallelizeBuildables = "YES"

Luma.xcodeproj/xcshareddata/xcschemes/LumaWatch.xcscheme

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Scheme
-   LastUpgradeVersion = "2660"
+   LastUpgradeVersion = "1600"
    version = "1.3">
    <BuildAction
       parallelizeBuildables = "YES"