Fixed win32 config saving, keyboard mapping, and AltGr bugs.

Made extensive changes to the launcher to provide more control
over setting up auto-start and it now saves configuration to
the user's documents directory if auto-starting at login and
saves to the system directory if auto-starting at boot.
Replaced MapVirtualKey() with table lookup to work around that
function's lack of support for extended keyboard scan codes.
Added first cut at support for AltGr.

lib/client/CMSWindowsSecondaryScreen.cpp

@@ -459,6 +459,7 @@ CMSWindowsSecondaryScreen::updateKeys()
 	if ((m_keys[VK_SCROLL] & 0x01) != 0) {
 		m_mask |= KeyModifierScrollLock;
 	}
+	// note -- do not save KeyModifierModeSwitch in m_mask
 	log((CLOG_DEBUG2 "modifiers on update: 0x%04x", m_mask));
 }
 
@@ -634,6 +635,11 @@ CMSWindowsSecondaryScreen::mapKey(Keystrokes& keys, UINT& virtualKey,
 								KeyModifierAlt |
 								KeyModifierMeta));
 
+	// set control and alt if mode shift (AltGr) is requested
+	if ((mask & KeyModifierModeSwitch) != 0) {
+		outMask |= KeyModifierControl | KeyModifierAlt;
+	}
+
 	// extract extended key flag
 	const bool isExtended = ((virtualKey & 0x100) != 0);
 	virtualKey           &= ~0x100;