Refactor/move demuxer options to struct

[AhmedAlian7]

[IMPROVEMENT]

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closes #2101

Summary

Resolves the TODO in file_functions.c:311 by encapsulating demuxer-related options within the ccx_demuxer struct instead of accessing the global ccx_options.

Problem

Multiple functions directly accessed global ccx_options for 4 options that logically belong to the demuxer context:

• live_stream - Live stream mode and timeout
• buffer_input - Whether to buffer input data
• input_source - Source type (file, stdin, network, tcp)
• binary_concat - Whether to concatenate binary files

This caused issues with testability, encapsulation, thread safety, and library reusability.

Changes

src/lib_ccx/ccx_demuxer.h

Added 4 new fields to struct ccx_demuxer:

// Options moved from global ccx_options for encapsulation
int live_stream;                   // -1=live no timeout, 0=regular file, >0=live with timeout
int buffer_input;                  // Buffer input data
enum ccx_datasource input_source;  // Source type (file, stdin, network, tcp)
int binary_concat;                 // Concatenate binary files

src/lib_ccx/ccx_demuxer.c

init_demuxer() - Initialize new fields from global options:

ctx->live_stream = ccx_options.live_stream;
ctx->buffer_input = ccx_options.buffer_input;
ctx->input_source = ccx_options.input_source;
ctx->binary_concat = ccx_options.binary_concat;

ccx_demuxer_close() - Updated to use ctx->input_source.
ccx_demuxer_open() - Updated all input source checks to use ctx->input_source.

src/lib_ccx/file_functions.c

sleepandchecktimeout() - Added ctx parameter.
buffered_read_opt() - Updated all 4 options to use ctx->.
get_total_file_size() - Updated to use ctx->demux_ctx->live_stream.
switch_to_next_file() - Updated all options to use ctx->demux_ctx->.

Testing

• Build succeeds on Linux (make in linux directory)
• Executable runs correctly (ccextractor --version)
• No remaining global references for the 4 options in affected functions
• I have mentioned this change in the changelog.

Impact

• No breaking changes - Options are still initialized from global ccx_options at demuxer creation
• Improved encapsulation - Demuxer now owns its configuration
• Better testability - Functions can be tested with different option values via context

[AhmedAlian7]

Code passes all tests locally, but failed on GitHub CI cuz github server issues