PR#40 (M): Added buffer management for raw USB reads

[malikalhack]

Linked Task

Closes #11

Commits

• Updated Doxygen capture paths
• Fixed queue Doxygen symbols
• Updated architecture documentation
• Documented tests directory
• Updated gitignore file
• Verified raw USB packet buffering
• Added raw USB packet buffering
• Added DRY and KISS rules

Author Checklist

• added generated documentation;
• added a description of the work completed to the history file;
• successfully generated the documentation, and it meets expectations;
• successfully compiled the library on Linux;

Testing

• ./linux_build.sh -c -d
• make debug
• manual UI check

The build was performed on Linux Mint 21.3.

[malikalhack]

• Added a fixed-capacity FIFO between USB reads and packet processing.
• Store each raw response with its actual transferred length and support the
  largest known two-channel DSO-2250 capture without allocation in the active
  acquisition loop.
• Keep the USB producer non-blocking by discarding the oldest queued response
  when processing falls behind, with a thread-safe dropped-packet count.
• Added a processing consumer that preserves the existing capture-state update
  while decoupling it from the USB polling thread.
• Close the queue and wake the consumer during Stop and terminal USB errors;
  join both workers before releasing USB resources.
• Added deterministic CTest coverage for FIFO order, response length, overflow,
  close/reset behavior, and concurrent producer-consumer operation.
• Moved the expanded capture module into capture/inc/ and capture/src/.