Added new Logger class to handle info, warning and error logging throughout the framework.

By default logging behaves exactly as it did before, but it can now be customized to register log callbacks (C or Lua) for logging to custom outputs.
The GP_WARN and GP_ERROR macros now call Logger::log.

gameplay/gameplay.xcodeproj/project.pbxproj

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 		5BD52676150F8258004C9099 /* PhysicsCollisionObject.h in Headers */ = {isa = PBXBuildFile; fileRef = 5BD5266E150F8258004C9099 /* PhysicsCollisionObject.h */; };
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+		B67EC8F8161DFCA8000B4D12 /* Logger.h in Headers */ = {isa = PBXBuildFile; fileRef = B67EC8F5161DFCA8000B4D12 /* Logger.h */; };
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@@ -2611,6 +2623,12 @@
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@@ -2782,6 +2800,8 @@
 				5BD52643150F822A004C9099 /* Layout.h */,
 				42CD0DE6147D8FF50000361E /* Light.cpp */,
 				42CD0DE7147D8FF50000361E /* Light.h */,
+				B67EC8F4161DFCA8000B4D12 /* Logger.cpp */,
+				B67EC8F5161DFCA8000B4D12 /* Logger.h */,
 				42CD0DE8147D8FF50000361E /* Material.cpp */,
 				42CD0DE9147D8FF50000361E /* Material.h */,
 				42CD0DEA147D8FF50000361E /* MaterialParameter.cpp */,
@@ -3397,6 +3417,10 @@
 				42BCD3A615EFD0F300C0E076 /* lua_Light.h */,
 				42BCD3A715EFD0F300C0E076 /* lua_LightType.cpp */,
 				42BCD3A815EFD0F300C0E076 /* lua_LightType.h */,
+				B67EC8E7161DFC8E000B4D12 /* lua_Logger.cpp */,
+				B67EC8E8161DFC8E000B4D12 /* lua_Logger.h */,
+				B67EC8E9161DFC8E000B4D12 /* lua_LoggerLevel.cpp */,
+				B67EC8EA161DFC8E000B4D12 /* lua_LoggerLevel.h */,
 				42BCD3A915EFD0F300C0E076 /* lua_Material.cpp */,
 				42BCD3AA15EFD0F300C0E076 /* lua_Material.h */,
 				42BCD3AB15EFD0F300C0E076 /* lua_MaterialParameter.cpp */,
@@ -4076,6 +4100,9 @@
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 				421FBD5E1602827C00A61BC0 /* lua_PhysicsVehicle.h in Headers */,
 				421FBD621602827C00A61BC0 /* lua_PhysicsVehicleWheel.h in Headers */,
+				B67EC8ED161DFC8E000B4D12 /* lua_Logger.h in Headers */,
+				B67EC8F1161DFC8E000B4D12 /* lua_LoggerLevel.h in Headers */,
+				B67EC8F8161DFCA8000B4D12 /* Logger.h in Headers */,
 			);
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@@ -4503,6 +4530,9 @@
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 				421FBD631602827C00A61BC0 /* lua_PhysicsVehicleWheel.h in Headers */,
+				B67EC8EE161DFC8E000B4D12 /* lua_Logger.h in Headers */,
+				B67EC8F2161DFC8E000B4D12 /* lua_LoggerLevel.h in Headers */,
+				B67EC8F9161DFCA8000B4D12 /* Logger.h in Headers */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
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@@ -4991,6 +5021,9 @@
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 				421FBD601602827C00A61BC0 /* lua_PhysicsVehicleWheel.cpp in Sources */,
 				F1616ABC1614E24B008DD8B7 /* MathUtil.cpp in Sources */,
+				B67EC8EB161DFC8E000B4D12 /* lua_Logger.cpp in Sources */,
+				B67EC8EF161DFC8E000B4D12 /* lua_LoggerLevel.cpp in Sources */,
+				B67EC8F6161DFCA8000B4D12 /* Logger.cpp in Sources */,
 			);
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@@ -5415,6 +5448,9 @@
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 				421FBD611602827C00A61BC0 /* lua_PhysicsVehicleWheel.cpp in Sources */,
 				F1616ABD1614E24B008DD8B7 /* MathUtil.cpp in Sources */,
+				B67EC8EC161DFC8E000B4D12 /* lua_Logger.cpp in Sources */,
+				B67EC8F0161DFC8E000B4D12 /* lua_LoggerLevel.cpp in Sources */,
+				B67EC8F7161DFCA8000B4D12 /* Logger.cpp in Sources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
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