Added additive and multiplicative modifiers.

Also changed all UI input fields to number, added min and max values
where necessary.
Since BotT , Enforcer and Zei's at rank 0 already give a percentage
bonus, added checkbox for them. Whith Zei's, this is causing some visual
issues, though, can't seem to fix it.
Added alts to all most images, only not on active skills both in
selections and results.
Added Chakram skill damage field, but blanked out thusfar.
Concerning support skills: I can't find the link for the specific runes
for tooltip, so I put the tooltips in images folder, can't seem to get
them to display properly though.
Grouped variables in dpscalc.js
Changed extra damage to jewelry damage for clarity.