Updating commands for "rules.d"

It's seem etc folder no longer exist, now it's on "stlink/config/udev/rules.d" instead of "stlink/etc/udev/rules.d".

(Closes #1014)

[feature] Option bytes on the STM32F767 ZIT6 Nucleo-144

(Closes #1006)

Corrected file paths and settings for Debian package distribution

Remove ccpp.yml from workflows

- man-pages
- desktop-file and icons
- Fix for external CMAKE_MODULE_PATH
- udev-rules
- headers & stlink-gui.ui

- Updated CHANGELOG.md
- cpack: corrections for pkg config

Add support for writing option bytes to the Nucleo 144 STM32F767ZI. This adds --area=option_boot_add, --area=optcr and --area=optcr1

Added support for FreeBSD's libusb reimplementation

Closes: #963219

The 2 loaders were rewritten from scratch

FreeBSD reimplemented the libusb API, but their
implementation of libusb_set_debug() expects an
enum libusb_debug_level instead of an
enum libusb_log_level. This causes excessive
logging on FreeBSD drowning out all expected
output.

To keep the changes to other platforms minimal
the FreeBSD specific code is kept inside an
ifdef block and the enum values are recreated
as magic numbers just like the log levels for
other platforms.

st-flash: Fix for mmap() size_t overflow

[regression] Changed timeout on flash write

- Changed header installation path
- Fix for cpack output directory

(Closes #642)