impr: Get rid of cimgui shared library by hooking pinvoke handler

lib/libimhex/include/hex/api/imhex_api.hpp

@@ -664,6 +664,12 @@ namespace hex {
              */
             std::optional<InitialWindowProperties> getInitialWindowProperties();
 
+            /**
+             * @brief Gets the module handle of libimhex
+             * @return Module handle
+             */
+            void* getLibImHexModuleHandle();
+
         }
 
         /**

lib/libimhex/include/hex/helpers/utils.hpp

@@ -331,4 +331,14 @@ namespace hex {
 
     [[nodiscard]] std::string formatSystemError(i32 error);
 
+    /**
+     * Gets the shared library handle for a given pointer
+     * @param symbol Pointer to any function or variable in the shared library
+     * @return The module handle
+     * @warning Important! Calling this function on functions defined in other modules will return the handle of the current module!
+     *          This is because you're not actually passing a pointer to the function in the other module but rather a pointer to a thunk
+     *          that is defined in the current module.
+     */
+    [[nodiscard]] void* getContainingModule(void* symbol);
+
 }

lib/libimhex/source/api/imhex_api.cpp

@@ -599,6 +599,11 @@ namespace hex {
             return impl::s_initialWindowProperties;
         }
 
+        void* getLibImHexModuleHandle() {
+            return hex::getContainingModule((void*)&getLibImHexModuleHandle);
+        }
+
+
         const std::map<std::string, std::string>& getInitArguments() {
             return *impl::s_initArguments;
         }

lib/libimhex/source/api/plugin_manager.cpp

@@ -344,5 +344,4 @@ namespace hex {
         });
     }
 
-
 }

lib/libimhex/source/helpers/utils.cpp

@@ -16,9 +16,11 @@
     #include <wolv/utils/guards.hpp>
 #elif defined(OS_LINUX)
     #include <unistd.h>
+    #include <dlfcn.h>
     #include <hex/helpers/utils_linux.hpp>
 #elif defined(OS_MACOS)
     #include <unistd.h>
+    #include <dlfcn.h>
     #include <hex/helpers/utils_macos.hpp>
 #elif defined(OS_WEB)
     #include "emscripten.h"
@@ -784,4 +786,23 @@ namespace hex {
         #endif
     }
 
+
+    void* getContainingModule(void* symbol) {
+        #if defined(OS_WINDOWS)
+            MEMORY_BASIC_INFORMATION mbi;
+            if (VirtualQuery(symbol, &mbi, sizeof(mbi)))
+                return mbi.AllocationBase;
+
+            return nullptr;
+        #elif !defined(OS_WEB)
+            Dl_info info;
+            if (dladdr(symbol, nullptr) == 0)
+                return nullptr;
+
+            return dlopen(info.dli_fname, RTLD_LAZY);
+        #else
+            return nullptr;
+        #endif
+    }
+
 }

lib/libimhex/source/ui/imgui_imhex_extensions.cpp

@@ -4,6 +4,7 @@
 #include <imgui_internal.h>
 #include <implot.h>
 #include <implot_internal.h>
+#include <cimgui.h>
 #include <opengl_support.h>
 
 #undef IMGUI_DEFINE_MATH_OPERATORS