Add a bit of tools + make unselectable menu objects

+ fix compile error
+ move back to top of menus

source/tegraexplorer/tools.c

@@ -0,0 +1,26 @@
+#include "tools.h"
+#include "gfx.h"
+#include "../libs/fatfs/ff.h"
+#include "../gfx/gfx.h"
+#include "../utils/btn.h"
+
+void displayinfo(){
+    clearscreen();
+
+    FATFS *fs;
+    DWORD fre_clust, fre_sect, tot_sect;
+    int res;
+
+    gfx_printf("Getting storage info: please wait...");
+
+    res = f_getfree("sd:", &fre_clust, &fs);
+    gfx_printf("\nResult getfree: %d\n\n", res);
+
+    tot_sect = (fs->n_fatent - 2) * fs->csize;
+    fre_sect = fre_clust * fs->csize;
+
+    gfx_printf("%d KiB total\n%d KiB free\n\nPress any key to continue", tot_sect / 2, fre_sect / 2);
+
+
+    btn_wait();
+}