YMD96 complete QMK port (#3105)

* readded code for YMD96 full working

* added jj50 layout back

keyboards/ymd96/tools/README.md

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+# JJ40 Tools
+
+## usb_detach.c
+
+When trying to flash on Linux, you may encounter a "Resource Unavailable" error. This means that Linux's HID driver has taken exclusive control of the keyboard, and the program script can't flash it.
+This program can force Linux to give up a device, so that the programming script can reset it.
+
+### To compile:
+```
+gcc usb_detach.c -o usb_detach
+```
+
+### To run:
+1. Use `lsusb` to discover the Bus and Device numbers for your keyboard.
+2. Run the program: `sudo ./usb_detach /dev/bus/usb/<BUS>/<DEVICE>`.
+3. Build and program the firmware as normal.

keyboards/ymd96/tools/usb_detach.c

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+/* Found at https://www.linuxquestions.org/questions/linux-hardware-18/how-to-unclaim-usb-device-558138/#post3406986 */
+#include <stdio.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <linux/ioctl.h>
+#include <linux/usbdevice_fs.h>
+
+int main(int argc, char**argv)
+{
+        struct usbdevfs_ioctl command;
+        int ret;
+        int fd;
+        int i;
+        if (argc>1) {
+                fd = open(argv[1],O_RDWR);
+                if (fd<1){
+                        perror("unable to open file");
+                        return 1;
+                }
+                for (i=0;i<255;i++){ // hack: should fetch how many interface there is.
+                        command.ifno = i;
+                        command.ioctl_code = USBDEVFS_DISCONNECT;
+                        command.data = NULL;
+                        ret = ioctl(fd, USBDEVFS_IOCTL, &command);
+                        if(ret!=-1)
+                                printf("un claimed interface %d %d\n",i,ret);
+                }
+        } else {
+                printf ("usage: %s /dev/bus/usb/BUS/DEVICE\n",argv[0]);
+                printf("Release all interfaces of this usb device for usage in virtualisation\n");
+        }
+}