Remove dynamic loading of AI and scripting modules

Now instead of having AI and scripting as separate .dll/.so that is
dynamically loaded on requests, these components are part of VCMI
library directly. This removes need of custom code for Android/iOS where
dynamic loading is blocked as well removes multiple issues on desktop
platforms

Changes:
- Added libFacade module that actually generates libvcmi.so and has all
librrary components as its dependencies to resolve circular dependencies
- All library components are now OBJECT libraries (and not dynamic or
static libraries). Reasoning: STATIC libraries don't work due to way
linker walks through compiled units, and DYNAMIC would work, but would
keep overhead from inability to inline functions from library.
- Removed no longer necessary RPATH handling since here are no more AI
and scripting libraries to load
- Replaced CDynLibHandler with scaled down AIFactory class

AI/Nullkiller2/CMakeLists.txt

@@ -145,20 +145,13 @@ set(Nullkiller2_HEADERS
 		AIGateway.h
 )
 
-if(NOT ENABLE_STATIC_LIBS)
-	list(APPEND Nullkiller2_SRCS main.cpp StdInc.cpp)
-endif()
 assign_source_group(${Nullkiller2_SRCS} ${Nullkiller2_HEADERS})
 
-if(ENABLE_STATIC_LIBS)
-	add_library(Nullkiller2 STATIC ${Nullkiller2_SRCS} ${Nullkiller2_HEADERS})
-else()
-	add_library(Nullkiller2 SHARED ${Nullkiller2_SRCS} ${Nullkiller2_HEADERS})
-	install(TARGETS Nullkiller2 RUNTIME DESTINATION ${AI_LIB_DIR} LIBRARY DESTINATION ${AI_LIB_DIR})
-endif()
+add_library(Nullkiller2 OBJECT ${Nullkiller2_SRCS} ${Nullkiller2_HEADERS})
+target_compile_definitions(Nullkiller2 PRIVATE VCMI_DLL=1)
 
 target_include_directories(Nullkiller2 PUBLIC ${CMAKE_CURRENT_SOURCE_DIR})
-target_link_libraries(Nullkiller2 PUBLIC vcmi TBB::tbb)
+target_link_libraries(Nullkiller2 PUBLIC vcmiMain TBB::tbb)
 
 vcmi_set_output_dir(Nullkiller2 "AI")
 enable_pch(Nullkiller2)

AI/Nullkiller2/StdInc.cpp

@@ -1,10 +0,0 @@
-/*
- * StdInc.cpp, part of VCMI engine
- *
- * Authors: listed in file AUTHORS in main folder
- *
- * License: GNU General Public License v2.0 or later
- * Full text of license available in license.txt file, in main folder
- *
- */
-#include "StdInc.h"

AI/Nullkiller2/main.cpp

@@ -1,32 +0,0 @@
-/*
- * main.cpp, part of VCMI engine
- *
- * Authors: listed in file AUTHORS in main folder
- *
- * License: GNU General Public License v2.0 or later
- * Full text of license available in license.txt file, in main folder
- *
- */
-#include "StdInc.h"
-#include "AIGateway.h"
-
-#ifdef __GNUC__
-#define strcpy_s(a, b, c) strncpy(a, c, b)
-#endif
-
-static const char * const g_cszAiName = "Nullkiller2";
-
-extern "C" DLL_EXPORT int GetGlobalAiVersion()
-{
-	return AI_INTERFACE_VER;
-}
-
-extern "C" DLL_EXPORT void GetAiName(char * name)
-{
-	strcpy_s(name, strlen(g_cszAiName) + 1, g_cszAiName);
-}
-
-extern "C" DLL_EXPORT void GetNewAI(std::shared_ptr<CGlobalAI> & out)
-{
-	out = std::make_shared<NK2AI::AIGateway>();
-}