Make accounts, service, and result more Nim friendly

examples/helloworld/helloworld.nim

@@ -1,30 +1,17 @@
 import libnx/wrapper/gfx
 import libnx/wrapper/console
 import libnx/wrapper/hid
-import libnx/wrapper/applet
-
-proc printf(formatstr: cstring) {.importc: "printf", varargs,
-                                  header: "<stdio.h>".}
+import libnx/utils
 
 proc main() =
   gfxInitDefault()
-
   discard consoleInit(nil)
 
-  printf("\x1b[16;20HHello World From NIM!")
   echo "\x1b[17;20HHELLO FROM NIM"
-  while appletMainLoop():
-    hidScanInput()
-
+  mainLoop:
     let keysDown = hidKeysDown(CONTROLLER_P1_AUTO)
 
     if (keysDown and KEY_PLUS.uint64) > 0.uint64:
       break
 
-    gfxFlushBuffers()
-    gfxSwapBuffers()
-    gfxWaitForVsync()
-
-  gfxExit()
-
 main()