Bsongis/x7d fixes (#4019)

* [X7D] Various fixes

[Others]
- Fixes the Mixer / Inputs MOVE / COPY problem on X9E
- Adds the copy/paste/rename feature in SDCARD menu on X7D/SKY9X
- Merges some duplicated code using the new directory structure
- Cosmetics

radio/src/lua/api_lcd.cpp

@@ -766,6 +766,8 @@ const luaL_Reg lcdLib[] = {
   { "drawPixmap", luaLcdDrawPixmap },
   { "drawScreenTitle", luaLcdDrawScreenTitle },
   { "drawCombobox", luaLcdDrawCombobox },
+#else
+  { "getLastPos", luaLcdGetLastPos },
 #endif
   { NULL, NULL }  /* sentinel */
 };