add monitor_connection_worker thread, and set display mode automatically once the monitor is dropped and reconnected

fixed driver crash when fl2000_dev_init() failed

add kernel version check in fl2000_dev_select_interface so that the driver could work on kernel version 4.x.x and earlier

use GCC atomic instrinsic to operate count variables. Cancel all in-flight requests when URBs were stuck for a long time

workaround fl2000 failure on kernel 5.x. make driver pointer visible in the driver log

support more aggressive compression for low performance xHC, support output format = COLOR_FORMAT_RGB_16_555 with compression

add irqs_disabled() check in URB completion callback

remove DBG_RENDER flag, and add in_irq() check in fl2000_render_completion()

update on comment in fl2000_bulk.c

fixed URB scatter list bug, add compression support

report monitor plug in event only after the monitor EDID is processed

Merge pull request #11 from benpicco/master

remove NDA warnings

removed in-appropriate comments

fix usb_control_msg glitch on kernel 4.11.0 or above, fix compiler errors