[pob1-port] Add build comparison tab

[vaisest]

Changes from PathOfBuildingCommunity/PathOfBuilding#9543

Description of the problem being solved:

Steps taken to verify a working solution:

Tested combinations of the following builds:

• Perfect strike (stages): https://pobb.in/5uT8UUi3wbrn
• Minion: https://pobb.in/4E2iq980M6Pi
• Ritualist bear (3 rings, weapon set): https://pobb.in/WdQrse5PFoMt
• Flicker (dps N/A): https://pobb.in/t3JF-mMMglzN

Seems most of it is directly compatible with pob2, but various things are hidden behind different variables. These fixes mostly focus on fixing those mistakes. Skill sets were also added to the calcs tab (I honestly don't know what these are)

Todo:

• test

[vaisest]

As expected, there are issues with the mod matching. Namely, unique mods (not included in querymods.lua) and local mods. For example to accuracy rating ends up matching a global mod, even though it's usually a local mod: +# to accuracy rating (local). This issue is actually also present on the pob1 comparison tab too.

I'd prefer to fix this in my trader PR, since it focuses on similar issues. The purchase option seems to work fine otherwise.