Overhaul of manual-generation code

Plugins/UEWingman/Source/UEWingman/Handlers/Documentation_Manual.h

@@ -12,6 +12,9 @@ class UWing_Documentation_Manual : public UWingHandler
 	GENERATED_BODY()
 
 public:
+	UPROPERTY(EditAnywhere, meta=(Optional, Description="If specified, print only this section of the manual"))
+	FString Section;
+
 	virtual void Register() override
 	{
 		UWingServer::AddHandler(this,
@@ -19,6 +22,23 @@ public:
 	}
 	virtual void Handle() override
 	{
-		WingManual::PrintManual({WingManual::Section::All}, nullptr, false);
+		if (Section.IsEmpty())
+		{
+			UWingManualSections::FetcherPaths();
+			UWingManualSections::ExpressingTypes();
+			UWingManualSections::VariableDeclarations();
+			UWingManualSections::EscapeSequencesInFNames();
+			UWingManualSections::MaterialEditing();
+			UWingManualSections::ImportantCommands();
+		}
+		else
+		{
+			FName SectionName(*Section);
+			if (!WingManual::PrintSection(SectionName))
+			{
+				WingOut::Stdout.Printf(TEXT("ERROR: Unknown manual section '%s'\nAvailable sections: "), *Section);
+				WingManual::PrintSectionNames(WingManual::GetSections());
+			}
+		}
 	}
 };