SerialConnect: add a clear/reset menu.

Change-Id: I0435ba679e19094d201d65ac0c6290cd194ec344
Reviewed-on: https://review.haiku-os.org/c/1463
Reviewed-by: waddlesplash <waddlesplash@gmail.com>

SerialConnect: support sending raw files

Add a generic FileSender interface, which XModemSender implements. Add a
new RawSender which implements the same interface.

The RawSender currently blocks the application thread while sending,
which is not a good idea. Will rework this when I allow cancelling
transfers before they complete.

SerialConnect: implement XMODEM send.

SerialConnect: allow custom baudrates from the GUI

SerialConnect: add scripting support

It's now possible to configure the serial port through scripting:
hey SerialConnect set databits to 8
hey SerialConnect set parity to even
etc.

More useful is the ability to connect and disconnect from the port:
hey SerialConnect get port # returns "usb0"
hey SerialConnect set port to usb0
hey SerialConnect delete port

This allows a script to automatically disconnect SerialConnect, do
something with the serial port, and then reconnect SerialConnect. This
can be used for example to run a bootloader and update a firmware
through the same serial port used for debugging, something that's not
easily possible on other systems.

Make SerialConnect more complete

* Mark the current connected device, or disable "Disconnect" menu when
there is no connection.
* Save and restore serial port settings
* Improve drawing code: make sure the border around the termview is
repainted, and do not leave a 1px space between lines unpainted.

Log serial input to a file.

Serial port configuration

* Dynamically update the serial port list in the connection menu when devices get added or removed
* Make the settings in the settings menu actually do something

Working serial connection.
Still need some work on displaying the right chars at the right place.

WIP version of SerialConnect. Not working, but added to the tree anyway so :
* You can code review it
* You can help developping
Uses libvterm as the backend for parsing ANSI escape sequences. The lib was
changed slightly to build with GCC2. It could be used by Terminal as well as
it seems cleaner and more reliable than our current parser.

SerialConnect: add scripting support

It's now possible to configure the serial port through scripting:
hey SerialConnect set databits to 8
hey SerialConnect set parity to even
etc.

More useful is the ability to connect and disconnect from the port:
hey SerialConnect get port # returns "usb0"
hey SerialConnect set port to usb0
hey SerialConnect delete port

This allows a script to automatically disconnect SerialConnect, do
something with the serial port, and then reconnect SerialConnect. This
can be used for example to run a bootloader and update a firmware
through the same serial port used for debugging, something that's not
easily possible on other systems.

Make SerialConnect more complete

* Mark the current connected device, or disable "Disconnect" menu when
there is no connection.
* Save and restore serial port settings
* Improve drawing code: make sure the border around the termview is
repainted, and do not leave a 1px space between lines unpainted.

Log serial input to a file.

Serial port configuration

* Dynamically update the serial port list in the connection menu when devices get added or removed
* Make the settings in the settings menu actually do something

Working serial connection.
Still need some work on displaying the right chars at the right place.

WIP version of SerialConnect. Not working, but added to the tree anyway so :
* You can code review it
* You can help developping
Uses libvterm as the backend for parsing ANSI escape sequences. The lib was
changed slightly to build with GCC2. It could be used by Terminal as well as
it seems cleaner and more reliable than our current parser.