Add feature to compare files with different names while comparing directories

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  Description

  This PR adds a new feature to the Meld tool that allows comparing files or directories with different names while comparing directories. This feature enhances the flexibility of the directory comparison functionality.

Summary of Changes

• Added a new method select_left_file_to_compare in the DirDiff class to store the selected file or directory path on the left side.
• Added a new method select_right_file_to_compare in the DirDiff class to store the selected file or directory path on the right side.
• Modified the on_button_press_event method in the DirDiff class to add two new options in the context menu: "Select left file/dir to compare" and "Compare to 'filename'". These options allow the user to select the left file or directory to compare and the right file or directory with a different name to compare.
• Modified the compare_selected_files method in the DirDiff class to compare the files or directories stored in the class variables when the "Compare to 'filename'" option is selected.

Please review and merge this PR to incorporate the requested feature.

Fixes #2.

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Rollback Files For Sweep

• [ ] Rollback changes to meld/dirdiff.py

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