YoFrankie bug [#18857] On start gives ImportError: No module named frankie_scripts

GameEngine sys.path creation was broken because of a pesky slash at the end of each path name.
Win32 sys.paths were also failing when running a game that switched between blend files in different directories

On win32 for some reason making absolute paths from lib->name failed, work around this by using lib->filename.

STR_String.h, cast to float to quiet compiler warnings.

intern/string/STR_String.h

@@ -142,7 +142,7 @@ public:
 	inline operator const char *() const								{ return pData; }
 	inline char *Ptr()													{ return pData; }
 	inline const char *ReadPtr() const									{ return pData; }
-	inline float	ToFloat() const										{ float x=atof(pData); return x; }
+	inline float	ToFloat() const										{ float x=(float)atof(pData); return x; }
 	inline int		ToInt() const										{ return atoi(pData); }
 
 	// Operators