Made it possible to let the agent use system binaries if exists

[jessevz]

closes hashtopolis/server#1052

[Copilot]

Pull request overview

This pull request enables the agent to use system binaries (e.g., 7zr, uftpd) if they exist in the system PATH, falling back to local binaries in the current working directory. This addresses issue #1052 by adding flexibility in binary location management.

Key changes:

• Introduced a new retrieveBinary function that prioritizes local binaries and falls back to system binaries
• Replaced platform-specific (Windows/Linux) binary path logic with unified calls to retrieveBinary
• Simplified binary extraction commands by removing OS-specific conditional logic

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 11 comments.

File	Description
htpclient/helpers.py	Added new retrieveBinary function to locate binaries from local directory or system PATH; updated start_uftpd to use this function
htpclient/files.py	Replaced OS-specific 7zr path logic with retrieveBinary call for file extraction
htpclient/binarydownload.py	Updated binary checks and extraction commands across multiple methods (prince, preprocessor, cracker version) to use retrieveBinary instead of OS-specific path logic

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