Generic Writer

Based on the ideas established by vpype-gcode this adds a generic writer for writing generic formatting.

        gcode_writer_dict = {
            "scale": (-0.1, -0.1),
            "pattern_start": "(STITCH_COUNT: {stitch_total})\n"
            "(THREAD_COUNT: {color_change_count})\n"
            "(EXTENTS_LEFT: {extents_left:.3f})\n"
            "(EXTENTS_TOP: {extends_top:.3f})\n"
            "(EXTENTS_RIGHT: {extends_right:.3f})\n"
            "(EXTENTS_BOTTOM: {extends_bottom:.3f})\n"
            "(EXTENTS_WIDTH: {extends_width:.3f})\n"
            "(EXTENTS_HEIGHT: {extends_height:.3f})\n"
            "(COMMAND_STITCH: {stitch_count})\n"
            "(COMMAND_COLOR_CHANGE: {color_change_count})\n"
            "(COMMAND_TRIM: {trim_count})\n"
            "(COMMAND_STOP: {stop_count})\n"
            "(COMMAND_END: {end_count})\n",
            "metadata_entry": "({metadata_key}: {metadata_value})\n",
            "thread_entry": "(Thread{thread_index}: {thread_color} {thread_description} {thread_brand} {thread_catalog_number})\n",
            "stitch": "G00 X{x:.3f} Y{y:.3f}\nG00 Z{z:.1f}\n",
            "color_change": "M00\n",
            "stop": "M00\n",
            "end": "M30\n",
        }
        EmbPattern.write_embroidery(
            GenericWriter,
            pattern,
            "myfile.gcode,
            gcode_writer_dict,
        )

For example this creates a duplicate of the gcode writer within pyembroidery currently.