Dtale

* [454](https://github.com/man-group/dtale/issues/454): fixed issue with parenthesis & percent symbols in column names

* hotfix for chart code exports of category column analysis

* moved "Open In New Tab" button
* [135](https://github.com/man-group/dtale/issues/135): refactored column analysis code and updated code exports to include plotly charts

* resizable columns
* updated how click loader options are found
* Added loader for r datasets (`*.rda` files)
* updating the language menu option to list options dynamically

* [452](https://github.com/man-group/dtale/issues/452): handling of column names with periods & spaces as well as long names
* updated styling of windows to match that of Charts
* [448](https://github.com/man-group/dtale/issues/448): set default value of "ignore_duplicate" to True
* [442](https://github.com/man-group/dtale/issues/442): Dash Updates
* Split charts by y-axis values if there are multiple
* Saving charts off and building new ones
* Toggling which piece of data you're viewing
* Toggling language nav menu
* Instances popup changes
* updated preview to use DataPreview
* updated display of "memory usage" to numeral.js

* Updated MANIFEST.in to include requirements.txt