Add purple clickable icons for KRouterLink

[sairina]

Summary

Updated KIcon in KRouterLink so that KRouterLink now has icon and iconAfter props.

Addresses

Issue #135

Screenshots After

Examples of icon placement for icon and iconAfter props:

For LTR	For RTL

Screenshots Before

[indirectlylit]

#103 seems related?

[sairina]

Hmm, I'm not sure if this is related to this particular PR because I didn't work on any code around KButton for this, but I know this is one of the components that were mentioned that should all have similar behavior, so I'd be happy to take a look at this issue after this one is closed out!

Speaking of which, @indirectlylit , can you take a look at the updated KRouterLink code (specifically for the icon) - I made sure to fix the slot issue that had brought up the 1px red border. It turns out that because all of those icon slotting issues were taken care of from KLabeledIcon, there was no need to add a computed class to this component.

Before	After

[indirectlylit]

In chromium and firefox on mac I see this:

for:

        <KRouterLink
          text="router link (empty)"
          :to="{}"
          icon="facility"
          iconAfter="facility"
        />

[indirectlylit]

merging in so we can see everything together. Will file follow-up for cross-component consistency