karate-ui enhancements part 2

[vmchukky]

Add support for

1. resizing of featurePanel, rawContentPanel (vertical) and varsPanel (horizontal)
2. http request/response shown as addressable grid (clicking on method step to highlight corresponding row as mentioned in #306 | Ravinder | Adding Accordian Panel for step of type "method". #325 (comment))

[vmchukky]

@ptrthomas please review #495 at your convenience

[ptrthomas]

@vmchukky there's this big commit that dropped:
#444 (comment)

so I have wired the UI to the new model objects, I think it is working - but the old off-by-one errors may have been re-introduced. if you get a chance - do take a look

[vmchukky]

@ptrthomas will take a look

[vmchukky]

@ptrthomas #444 is shaping up pretty good, I didn't find any major issues in UI. I have one small PR (applied on top of latest cukexit branch in my fork), please review #515 at your convenience.

[ptrthomas]

@vmchukky this helps - thanks !

[ptrthomas]

closing and we can open a new one for 0.9.0 onwards