Unify rendering TileLayout

[kikostadinov]

closes https://github.com/telerik/kendo-themes-private/issues/137

[epetrow]

Just a few things I noticed so far:

• Why are we removing the <div class="k-card-title></div> element from the rendering? If it is intentional this leads to a smaller font size of the header -> 14px which differs from the design -> 16px
• Since we are unifying the rendering, do we need product specific tests e.g. tilelayout-react?
• If we are removing the k-cursor-move class from the TileLayout header in the reference rendering maybe it is a good idea to add a separate test to showcase it? It was changed from k-cursor-grab as part from this effort
• I don't think we should add both k-resize and k-resize-x, k-resize-y classes on the same element e.g. k-resize k-resize-x
• In general when passing string props, we tend to wrap them in double quotes e.g. columnWidth="1fr"
• I think the commit test(layout) should be changed to test(tilelayout) since we are modifying the TileLayout tests