introduce separate-meters concept for Mackie.

Devices like the SSL Nucleus have meters displayed separately from their 55x2 display

libs/surfaces/mackie/device_info.cc

@@ -57,6 +57,7 @@ DeviceInfo::DeviceInfo()
 	, _uses_ipmidi (false)
 	, _no_handshake (false)
 	, _has_meters (true)
+	, _has_separate_meters (false)
 	, _device_type (MCU)
 	, _name (X_("Mackie Control Universal Pro"))
 {
@@ -343,6 +344,14 @@ DeviceInfo::set_state (const XMLNode& node, int /* version */)
 		_has_meters = true;
 	}
 
+	if ((child = node.child ("HasSeparateMeters")) != 0) {
+		if ((prop = child->property ("value")) != 0) {
+			_has_meters = _has_separate_meters = string_is_affirmative (prop->value());
+		}
+	} else {
+		_has_separate_meters = false;
+	}
+
 	if ((child = node.child ("LogicControlButtons")) != 0) {
 		if ((prop = child->property ("value")) != 0) {
 			_uses_logic_control_buttons = string_is_affirmative (prop->value());

libs/surfaces/mackie/device_info.h

@@ -81,6 +81,7 @@ class DeviceInfo
 	bool uses_ipmidi() const;
 	bool no_handshake() const;
 	bool has_meters() const;
+	bool has_separate_meters() const;
 	const std::string& name() const;
 
 	static std::map<std::string,DeviceInfo> device_info;
@@ -109,6 +110,7 @@ class DeviceInfo
 	bool     _uses_ipmidi;
 	bool     _no_handshake;
 	bool     _has_meters;
+	bool     _has_separate_meters;
 	DeviceType _device_type;
 	std::string _name;
 	std::string _global_button_name;

mcp/nucleus.device

@@ -8,6 +8,7 @@
   <MasterFader value="no"/>
   <TimecodeDisplay value="no"/>
   <TwoCharacterDisplay value="yes"/>
+  <HasSeparateMeters value="yes"/>
   <GlobalControls value="yes"/>
   <JogWheel value="yes"/>
   <TouchSenseFaders value="yes"/>