Add support for Fujisan emulator

[pedgarcia]

New Fujisan TCP client (FujisanClient):

** REQUIRES Fujisan 1.1.7 or newer

• Connects to Fujisan’s TCP server and sends JSON commands.
• Wraps common operations: system.cold_boot, system.warm_boot, media.load_xex, config.set_hard_drive.
• Adds support for the new system.start_fujinet and system.stop_fujinet commands.

Fujisan run mode in the runtime:

• Adds startWithFujisan(...) to run programs via Fujisan over TCP, instead of launching Atari800/Altirra.
• Optionally auto-configures H4: to the project’s bin folder and remembers the last path to avoid unnecessary restarts.
• Supports a simple fujisanBootMode (none, warm, cold) to control how the machine is reset before loading the XEX.
• In “cold” mode, performs a stop -> wait -> start FujiNet-PC -> load XEX sequence with small delays so FujiNet is ready before the program touches the network.

Docs:

• Updates launch config / README text where needed to describe the Fujisan mode and boot mode option.

Together, these changes allow the extension to deploy XEX files to Fujisan, ensure FujiNet is in a good state, and make network-heavy programs work reliably without manual FujiNet restarts.