Add SyscallInfoEvent model class.
Add event class for the post-syscall debug message.
Adjust debug_utils functions.

The functions in question now return an error rather than simply calling
exit() directly when they fail, as this behavior wasn't acceptable for
e.g. Debugger. Adjusted all calling apps accordingly.
Extend Team's listener interface.

Add hooks for sending and listening for console output events.
TeamDebugger: Implement post syscall event handling.

We now watch for file write syscalls in the target team. If they
constitute a write to either stdout or stderr, we attempt to capture the
output, and notify interested listeners accordingly.
Adjust BCheckBox::MaxSize.

Previously BCheckBox returned unlimited width for its max size. This
became problematic if one wanted to put a checkbox in any kind of
horizontal layout with other controls, since they would expand to use as
much space as possible. This is also in contrast to other controls such
as BButton, which simply return the max to be the same as the preferred.
As such, adjust BCheckBox to do the same.
Implement #9758.

- Add ConsoleOutputView for showing the debugged team's console output.
The view presents checkboxes for controlling whether or not stdout
and/or stderr output is captured and shown, as well as the
ability to clear the current output.
Add support for auto-scrolling.

- If the console output is currently at the bottom, any new output will automatically be scrolled into view. Otherwise,
its current position will be maintained.
Adjust debug API to address some x86-64 concerns.

- The argument buffer contained in the debug_{pre,post}_syscall message structures wasn't large enough to accomodate all
arguments for some syscalls on x86-64, which could potentially have led to kernel memory corruption when using syscall
tracing via the debug API. As such, enlarge it to accomodate 64-bit platforms as well.

- Adjust TeamDebugger/SyscallInfo to discriminate the target architecture and read the arguments when trapping console
output. Gets the latter working on x86-64.