- 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/main.cpp

@@ -49,7 +49,7 @@ bool done = false;
 JApp *game = NULL;
 JGE *g_engine = NULL;
 
-u32 gTickFrequency;
+u32 gTickFrequency = 1;
 
 //------------------------------------------------------------------------------------------------
 // Exit callback
@@ -293,6 +293,14 @@ u8 JGEGetAnalogY() { return gCtrlPad.Ly; }
 // The main loop
 int main(int argc, char *argv[])
 {
+    pspDebugScreenInit();
+
+    pspDebugScreenSetBackColor(0x00000000);
+    pspDebugScreenSetTextColor(0xFFFFFFFF);
+    pspDebugScreenClear();
+
+    pspDebugScreenPrintf("Wagic:Loading core...");
+
     JLOG("SetupCallbacks()");
     SetupCallbacks();
 #ifdef DEVHOOK