VQkit v1.1 - QE multi-band plotting update

- Plots every numerical band contained in native QE two-column .dat/.gnu files.
- Reads blank-line-separated bands and also recovers blocks when k-path resets.
- Reads wide tables formatted as: k-path band_1 band_2 ... band_N.
- Ignores VQkit_BANDS.dat during automatic native QE file discovery so a generated
  export from an earlier run cannot shadow the original QE .gnu/.dat input.
- Native .gnu files are prioritized during automatic discovery.
- No K-path metadata prompt is required for plotting.
