esp32: directly call esp_vhci_host_check_send_available instead of tracking callback

esp32: place HCI from VHCI in ringbuffer to avoid blocking VHCI thread

esp32: update sdkconfig to disable bluedroid

esp32: extract component/btstack, depend on CONFIG_BLUEDROID_ENABLED=n, update README

esp32: fix compile of classic part

esp32: update readme

esp32: update readme

esp32: use max size acl payload

esp32: try spp_and_le_streamer

esp32: add classic sources

esp32: use semaphore to let VHCI task pause until packet is processed by btstack

esp32: follow update of esp-idf

esp32: started on FreeRTOS/Single Threaded integration

esp32: use twitter style account name

esp32: added README.md

esp32: Cleanup

esp32: Add fixes from @mringwal, mostly works now

esp32: Put btstack in its own task and fix missing byte in outgoing packets

esp32: Fix can_send_packet_now initialization

esp32: Use time_ms instead of ticks

esp32: Use generic transport instead

esp32: More hacks to get send/receive somewhat working

esp32: Add libcoexist

esp32: Add necessary libs, override gitignore .a rule

esp32: Partially implement hal_cpu layer