Implement QCommandLineParser

[HTRamsey]

Using QCommandLineParser allows much finer controls over parsing the command line options.
Move the handling to a separate file to help cleanup the main and QGCApplication files.

QGroundControl

Options:
-h, --help Displays help on commandline options.
--help-all Displays help, including generic Qt options.
-v, --version Displays version information.
--system-id MAVLink GCS system id.
--clear-settings Clear stored application settings.
--clear-cache Clear parameter and airframe caches.
--logging Enable logging with optional rules string.
--log-output Log to console.
--simple-boot-test Initialize subsystems and exit.
--unittest Run unit tests (optional filter value).
--unittest-stress Stress unit tests.
--fake-mobile Run with mobile-style UI.
--allow-multiple Bypass single-instance guard.
--qmljsdebugger Activates the QML/JS debugger with a specified
port. The value must be of format
port:1234[,block]. "block" makes the application
wait for a connection.

[Copilot]

Pull Request Overview

Replaces the custom CmdLineOptParser with Qt's standard QCommandLineParser for handling command line arguments. This modernizes the command line parsing implementation by using Qt's built-in functionality instead of a custom solution.

• Migrates from custom CmdLineOpt_t array structure to individual QCommandLineOption objects
• Adds proper help and version option support through Qt's standard methods
• Improves error handling for unknown options and unexpected positional arguments