xray each subgrid seperately

[Akuukis]

Is your feature request related to a problem? Please describe.

Subgrid xrays are overlaid at quite random, because grids are not aligned to each other. Also small grids show like a large grid.

Describe the solution you'd like

As suggested by @Whiplash141, xray each sub-grid separately, and show them in multiple tabs named by grid titles. Default to "main" grid (which is main in sbc file, is that the first one?)

Describe alternatives you've considered

Xray only the main grid