Fixed build errors when the plugin is placed in the engine directory. (#19)

Merged 4 commits fixing build errors when compiling this as an engine plugin:
- Changed include directives to use full paths (ex. <ICursor.h> -> <GenericPlatform/ICursor.h>).
- Added categories to FImGuiKeyInfo properties (required for all blueprint exposed types in engine plugins).
- Added explicit configuration of PCHUsage (without that it is assumed to be UseExplicitOrSharedPCHs in engine plugins and UseSharedPCHs in game ones) - amended to work also in the older engine versions.

Source/ImGui/ImGui.Build.cs

@@ -23,6 +23,8 @@ public class ImGui : ModuleRules
 		// Enable runtime loader, if you want this module to be automatically loaded in runtime builds (monolithic).
 		bool bEnableRuntimeLoader = true;
 
+		PCHUsage = PCHUsageMode.UseSharedPCHs;
+
 #if UE_4_21_OR_LATER
 		PrivatePCHHeaderFile = "Private/ImGuiPrivatePCH.h";
 #endif

Source/ImGui/Private/ImGuiContextProxy.h

@@ -6,7 +6,7 @@
 #include "ImGuiInputState.h"
 #include "Utilities/WorldContextIndex.h"
 
-#include <ICursor.h>
+#include <GenericPlatform/ICursor.h>
 
 #include <imgui.h>
 

Source/ImGui/Private/ImGuiImplementation.cpp

@@ -25,7 +25,7 @@ ImGuiContext** GImGuiContextPtrHandle = &GImGuiContextPtr;
 #endif // WITH_EDITOR
 
 #if PLATFORM_WINDOWS
-#include <AllowWindowsPlatformTypes.h>
+#include <Windows/AllowWindowsPlatformTypes.h>
 #endif // PLATFORM_WINDOWS
 
 #include "imgui.cpp"
@@ -35,7 +35,7 @@ ImGuiContext** GImGuiContextPtrHandle = &GImGuiContextPtr;
 #include "misc/stl/imgui_stl.cpp"
 
 #if PLATFORM_WINDOWS
-#include <HideWindowsPlatformTypes.h>
+#include <Windows/HideWindowsPlatformTypes.h>
 #endif // PLATFORM_WINDOWS
 
 #include "ImGuiInteroperability.h"
@@ -54,4 +54,4 @@ namespace ImGuiImplementation
 		GImGuiContextPtrHandle = Handle;
 	}
 #endif // WITH_EDITOR
-}
+}

Source/ImGui/Private/ImGuiInputHandler.cpp

@@ -13,9 +13,9 @@
 #include <Input/Events.h>
 
 #if WITH_EDITOR
-#include <Commands/InputBindingManager.h>
-#include <Commands/InputChord.h>
-#include <DebuggerCommands.h>
+#include <Framework/Commands/InputBindingManager.h>
+#include <Framework/Commands/InputChord.h>
+#include <Kismet2/DebuggerCommands.h>
 #endif // WITH_EDITOR
 
 

Source/ImGui/Private/ImGuiInteroperability.h

@@ -4,7 +4,7 @@
 
 #include "TextureManager.h"
 
-#include <ICursor.h>
+#include <GenericPlatform/ICursor.h>
 
 #include <imgui.h>
 

Source/ImGui/Private/ImGuiModule.cpp

@@ -15,7 +15,7 @@
 #include "Editor/ImGuiEditor.h"
 #endif
 
-#include <IPluginManager.h>
+#include <Interfaces/IPluginManager.h>
 
 #define IMGUI_REDIRECT_OBSOLETE_DELEGATES 1
 

Source/ImGui/Private/ImGuiModuleCommands.h

@@ -2,7 +2,7 @@
 
 #pragma once
 
-#include <IConsoleManager.h>
+#include <HAL/IConsoleManager.h>
 
 
 struct FImGuiKeyInfo;

Source/ImGui/Private/ImGuiModuleManager.cpp

@@ -7,7 +7,7 @@
 #include "ImGuiInteroperability.h"
 #include "Utilities/WorldContextIndex.h"
 
-#include <ModuleManager.h>
+#include <Modules/ModuleManager.h>
 
 #include <imgui.h>
 

Source/ImGui/Private/ImGuiModuleSettings.h

@@ -17,19 +17,19 @@ struct FImGuiKeyInfo
 {
 	GENERATED_BODY()
 
-	UPROPERTY(EditAnywhere)
+	UPROPERTY(EditAnywhere, Category = "Input")
 	FKey Key;
 
-	UPROPERTY(EditAnywhere)
+	UPROPERTY(EditAnywhere, Category = "Input")
 	ECheckBoxState Shift = ECheckBoxState::Undetermined;
 
-	UPROPERTY(EditAnywhere)
+	UPROPERTY(EditAnywhere, Category = "Input")
 	ECheckBoxState Ctrl = ECheckBoxState::Undetermined;
 
-	UPROPERTY(EditAnywhere)
+	UPROPERTY(EditAnywhere, Category = "Input")
 	ECheckBoxState Alt = ECheckBoxState::Undetermined;
 
-	UPROPERTY(EditAnywhere)
+	UPROPERTY(EditAnywhere, Category = "Input")
 	ECheckBoxState Cmd = ECheckBoxState::Undetermined;
 
 	friend bool operator==(const FImGuiKeyInfo& Lhs, const FImGuiKeyInfo& Rhs)

Source/ImGui/Public/ImGuiModule.h

@@ -6,7 +6,7 @@
 #include "ImGuiModuleProperties.h"
 #include "ImGuiTextureHandle.h"
 
-#include <ModuleManager.h>
+#include <Modules/ModuleManager.h>
 
 
 class FImGuiModule : public IModuleInterface