Overhaul Inspect Splits Page

[isaacfink21]

This PR updates the inspect splits page with several additions, including:

• A nucleotide/amino acid display
• Coloring genes by COG, KEGG metabolic categories, or by gene ID
• Visualization of insertions/deletions
• Highlight bars for nucleotides

[isaacfink21]

It should be fixed now - sorry about that! I must have committed a broad part of the anvio directory so I'll make sure to commit specific files in the future :)

I also fixed the amino acid sequence to work with genes in the reverse direction and added a button on the sidebar to toggle the nucleotide display.

[meren]

Hey @isaacfink21, in master we are able to click on SNVs to see this panel:

But it seems SNVs are no longer 'clickable' :)

[isaacfink21]

Thanks for pointing this out! I had disabled pointer-events on SVG text to prevent the selection of the sequences or x-scale - the first commit above should fix this and has a better implementation :)