Major mail protocol/filter settings rework.

* Instead of abusing BArchive::Archive() we now use a BMailSettingsView as
  a base view for all filter/protocol settings that works with
  BMailAddOnSettings.
* Cleanups in E-mail which is now completely layout friendly. But also still
  crashes when changing the views.

headers/os/add-ons/mail_daemon/MailFilter.h

@@ -11,17 +11,15 @@
 
 
 class BMailProtocol;
-class BView;
+class BMailSettingsView;
 
 
 class BMailFilter {
 public:
 								BMailFilter(BMailProtocol& protocol,
-									BMailAddOnSettings* settings);
+									const BMailAddOnSettings* settings);
 	virtual						~BMailFilter();
 
-	virtual BString				DescriptiveName() const = 0;
-
 	// Message hooks if filter is installed to an inbound protocol
 	virtual	void				HeaderFetched(const entry_ref& ref,
 									BFile* file);
@@ -36,15 +34,18 @@ public:
 
 protected:
 			BMailProtocol&		fMailProtocol;
-			BMailAddOnSettings*	fSettings;
+			const BMailAddOnSettings* fSettings;
 };
 
 
 // Your filter needs to export these hooks in order to be picked up
-extern "C" BView* instantiate_filter_config_panel(BMailAddOnSettings& settings);
+extern "C" BMailSettingsView* instantiate_filter_settings_view(
+	const BMailAccountSettings& accountSettings,
+	const BMailAddOnSettings& settings);
+extern "C" BString filter_name(const BMailAccountSettings& accountSettings,
+	const BMailAddOnSettings* settings);
 extern "C" BMailFilter* instantiate_filter(BMailProtocol& protocol,
-	BMailAddOnSettings* settings);
-extern "C" BString filter_name();
+	const BMailAddOnSettings& settings);
 
 
 #endif	// _MAIL_FILTER_H

headers/os/add-ons/mail_daemon/MailProtocol.h

@@ -22,6 +22,7 @@
 
 
 class BMailFilter;
+class BMailSettingsView;
 class BView;
 
 
@@ -103,7 +104,7 @@ protected:
 									const BMailProtocolSettings& settings);
 
 private:
-			BMailFilter*		_LoadFilter(BMailAddOnSettings* filterSettings);
+			BMailFilter*		_LoadFilter(const BMailAddOnSettings& settings);
 
 protected:
 			const BMailAccountSettings fAccountSettings;
@@ -149,12 +150,14 @@ public:
 
 
 // Your protocol needs to export these hooks in order to be picked up
-extern "C" _EXPORT BInboundMailProtocol* instantiate_inbound_protocol(
+extern "C" BInboundMailProtocol* instantiate_inbound_protocol(
 	const BMailAccountSettings& settings);
-extern "C" _EXPORT BOutboundMailProtocol* instantiate_outbound_protocol(
+extern "C" BOutboundMailProtocol* instantiate_outbound_protocol(
 	const BMailAccountSettings& settings);
-extern "C" _EXPORT BView* instantiate_protocol_config_panel(
-	BMailAccountSettings& settings);
+
+extern "C" BMailSettingsView* instantiate_protocol_settings_view(
+	const BMailAccountSettings& accountSettings,
+	const BMailProtocolSettings& settings);
 
 
 #endif	// _MAIL_PROTOCOL_H

headers/os/add-ons/mail_daemon/MailSettingsView.h

@@ -0,0 +1,25 @@
+/*
+ * Copyright 2012, Haiku, Inc. All Rights Reserved.
+ * Distributed under the terms of the MIT License.
+ */
+#ifndef _MAIL_SETTINGS_VIEW_H
+#define _MAIL_SETTINGS_VIEW_H
+
+
+#include <MailSettings.h>
+#include <View.h>
+
+
+class BMailSettingsView : public BView {
+public:
+								BMailSettingsView(const char* name);
+	virtual						~BMailSettingsView();
+
+//	virtual BString				DescriptiveName() const = 0;
+
+	virtual status_t			SaveInto(
+									BMailAddOnSettings& settings) const = 0;
+};
+
+
+#endif	// _MAIL_SETTINGS_VIEW_H