aim: do not reduce prediction for grenades

refactor: standardize access to bot files
graph: allow to specify graph upload url via cvar
graph. do not spam if extensions files  are not found

src/engine.cpp

@@ -834,7 +834,7 @@ bool Game::loadCSBinary () {
 bool Game::postload () {
 
    // register logger
-   logger.initialize (strings.format ("%slogs/%s.log", graph.getDataDirectory (false), product.folder), [] (const char *msg) {
+   logger.initialize (util.buildPath (BotFile::LogFile), [] (const char *msg) {
       game.print (msg);
    });