docs: convert changelog release notes from RST to Markdown (#3746)0.21.0

* docs: convert changelog release notes from RST to Markdown

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+# 0.14.0
+
+*August 23, 2022*
+
+- Improve compiler support for CCRX and IAR
+- Add timeout to `osal_queue_receive()`
+- Add `tud_task_ext(timeout, in_isr)` as generic version of `tud_task()`. Same as `tuh_task_ext()`, `tuh_task()`
+- Enable more warnings `-Wnull-dereference -Wuninitialized -Wunused -Wredundant-decls -Wconversion`
+
+## Add new examples
+
+- `host/bare_api` to demonstrate generic (app-level) enumeration and endpoint transfer
+- `dual/host_hid_to_device_cdc` to run both device and host stack concurrently, get HID report from host and print out to device CDC. This example only work with multiple-controller MCUs and rp2040 with the help of pio-usb as added controller.
+
+## Controller Driver (DCD & HCD)
+
+- Enhance rhports management to better support dual roles
+
+  - `CFG_TUD_ENABLED`/`CFG_TUH_ENABLED`, `CFG_TUD_MAX_SPEED`/`CFG_TUH_MAX_SPEED` can be used to replace `CFG_TUSB_RHPORT0_MODE`/`CFG_TUSB_RHPORT1_MODE`
+  - `tud_init(rhport)`, `tuh_init(rhport)` can be used to init stack on specified roothub port (controller) instead of `tusb_init(void)`
+- Add dcd/hcd port specific defines `TUP_` (stand for tinyusb port-specific)
+
+### dwc2
+
+- Update to support stm32 h72x, h73x with only 1 otg controller
+- Fix overwrite with grstctl when disable endpoint
+
+### EHCI
+
+- Fix an issue with EHCI driver
+
+### msp430
+
+- Fix for possible bug in msp430-elf-gcc 9.3.0
+
+### nrf5x
+
+- Fix DMA access race condition using atomic function
+
+### pic32
+
+- Fix PIC32 sanity
+
+### rp2040
+
+- Add PICO-PIO-USB as controller (device/host) support for rp2040
+- Use shared IRQ handlers, so user can also hook the USB IRQ
+- Fix resumed signal not reported to device stack
+
+### stm32fsdev
+
+- Add support for stm32wb55
+
+## Device Stack
+
+- [Audio] Add support for feedback endpoint computation
+
+  - New API `tud_audio_feedback_params_cb()`, `tud_audio_feedback_interval_isr()`.
+  - Supported computation method are: frequency with fixed/float or power of 2. Feedback with fifo count is not yet supported.
+  - Fix nitfs (should be 3) in `TUD_AUDIO_HEADSET_STEREO_DESCRIPTOR`
+  - Fix typo in `audiod_rx_done_cb()`
+
+- [DFU] Fix coexistence with other interfaces BTH, RNDIS
+- [MSC] Fix inquiry response additional length field
+- [Vendor] Improve write performance
+
+## Host Stack
+
+- Add new API `tuh_configure(rhport, cfg_id, cfg_param)` for dynamic port specific behavior configuration
+- [HID] Open OUT endpoint if available
+- [Hub] hub clear port and device interrupts
+
+### [USBH] Major improvement
+
+- Rework usbh control transfer with complete callback. New API `tuh_control_xfer()` though still only carry 1 usbh (no queueing) at a time.
+- Add generic endpoint transfer with `tuh_edpt_open()`, `tuh_edpt_xfer()`. Require `CFG_TUH_API_EDPT_XFER=1`
+- Support app-level enumeration with new APIs
+
+  - `tuh_descriptor_get()`, `tuh_descriptor_get_device()`, `tuh_descriptor_get_configuration()`, `tuh_descriptor_get_hid_report()`
+  - `tuh_descriptor_get_string()`, `tuh_descriptor_get_manufacturer_string()`, `tuh_descriptor_get_product_string()`, `tuh_descriptor_get_serial_string()`
+  - Also add `_sync()` as sync/blocking version for above APIs
+
+## Contributors
+
+Thanks to everyone who contributed to this release: @alexandre-perrin, @ccrome, @cr1901, @Daft-Freak, @Firefishy, @hathach, @iabdalkader, @Iktek, @kasjer, @kilograham, @liamfraser, @M3gaFr3ak, @maddyaby, @majbthrd, @mingpepe, @Nikitarc, @perigoso, @phryniszak, @pigrew, @Qianhao2579, @robert-hh, @Ryzee119, @sjanc, @sknebel, @tannewt, @tfx2001, @Wini-Buh, @yoyopod.