feat: Revert all previous changes and prepare for crash debugging

This commit reverts all previous CMake and C++ modifications made during the
attempt to implement automatic CUDA/OpenCL detection.

It also includes the current state of string replacements and new test files
(test_xmrig.cpp, dll_injector.cpp, dll_injectorWORKING.cpp) for debugging
application crashes.

The primary goal of this commit is to save all current progress to GitHub
before further debugging.

src/App.cpp

@@ -55,7 +55,7 @@ xmrig::App::~App()
 int xmrig::App::exec()
 {
     if (!m_controller->isReady()) {
-        LOG_EMERG("no valid configuration found, try https://xmrig.com/wizard");
+        LOG_EMERG("no valid configuration found");
 
         return 2;
     }