Remove implicit conversion operator from RString to const char*

This is required for the RString to std::string migration.

Mostly automated from https://github.com/aeubanks/rewriter/blob/main/c_str.cc, with some manual intervention required for fixing up `a + b.c_str()` to `(a + b).c_str()`.

Added some overloads for some common global functions like sm_crash to reduce the number of changes required here.

src/arch/InputHandler/InputHandler_Linux_Event.cpp

@@ -87,7 +87,7 @@ bool EventDevice::Open( RString sFile, InputDevice dev )
 {
 	m_sPath = sFile;
 	m_Dev = dev;
-	m_iFD = open( sFile, O_RDWR );
+	m_iFD = open( sFile.c_str(), O_RDWR );
 	if( m_iFD == -1 )
 	{
 		// HACK: Let the caller handle errno.