- fix compilation issue on psp

- attempt at reducing loading times on the PSP: I merged a few graphics files together, removed some unused calls from the initialization functions, and moved some other ones to have a more lazy approach. The PSP version remains fairly slow in some parts (especially loading, but also entering the shop, or starting a new game), so I will try to reduce file access as much as possible in the days to come. Not a release blocker IMO though, but I4d sure love if it were faster.
- uppercased "Track1.mp3" to be in line with the actual filename. Most likely this had been broken forever on case-sensitive OSes
- I removed costly calls from the textscroller. I believe it wasn't very useful in its previous state. Now it's only "advertising" for unlockable stuff, which I think is ok (and allows to refresh it every time the menu is loaded)
- As a counterpart, added a "% complete" progress bar in the menu, something I wanted to add a while ago.

JGE/src/JLogger.cpp

@@ -1,24 +1,34 @@
 #include "../include/JLogger.h"
+#include "../include/JGE.h"
 #include "../include/DebugRoutines.h"
 
 #include <fstream>
 
 string JLogger::lastLog = "";
+int JLogger::lastTime = 0;
 
 void JLogger::Log(const char * text){
 #ifdef DOLOG
   std::ofstream file(LOG_FILE, std::ios_base::app);
+  std::stringstream out;
+  int newTime = JGEGetTime();
+  out << newTime << "(+" << newTime - lastTime << ") :" << text;
   if (file){
-    file << text;
+    file << out.str();
     file << "\n";
     file.close();
+    lastTime = newTime;
   }
 
-  DebugTrace(text);
+  DebugTrace(out.str());
 #endif
   lastLog = text;
 }
 
+void JLogger::Log(std::string text){
+    Log(text.c_str());
+}
+
 JLogger::JLogger(const char* text) : mText(text)
 {
 #ifdef DOLOG