Fix TS Import in VirtuosoGrid

Regression reported in #43

Remove scarf after concerns raised in #140

v0.17.4

v0.17.4

Grid performance improvements

Merged #136

fix initialTopMostItemIndex and defaultItemHeight

Repro in #132

Fixed groupIndex regression, perf optimization in virtuoso grid

Issues: #130 and #124 .

`rangeChanged` added to the grid

Merged #121.

scrollingStateChange optimization

Fix minor issue of calling scrollingStateChange multiple times. Resolves #114 .

SSR in VirtuosoGrid, Clamp scrollTop

Includes the following PRs:

#112 - scrollToIndex going negative
#113 - adds initialItemCount to VirtuosoGrid

Expose scroll seek in grouped virtuoso

Merged the PR #110

Add Scarf for analytics

I have no idea how many people use this library, so I hope Scarf will help me with that.