Refactor builddrivers.py for safety and error handling

[54J4N]

• Replace all os.system() calls with safe alternatives to prevent command injection
• Fix bare except: clause that could catch KeyboardInterrupt and SystemExit
• Add path sanitization to prevent shell injection attacks
• Fix PHP version validation with proper regex instead of flawed string comparison
• Replace hardcoded backslashes with os.sep for cross-platform compatibility
• Add proper error handling for os.chdir() operations
• Fix variable reference bugs (self.repo vs repo, self.branch vs branch)
• Prevent infinite loops in get_local_source() with proper empty path validation
• Add comprehensive source folder validation before copying
• Improve error messages and log file display on build failure
• Fix interactive mode input validation and retry logic

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