Fix multiple memory leaks in UserCountryMap (#11350)

* Upgrade to Raphael 2.2.7 to fix serious memory leak in UserCountryMap

Kartograph stores data on SVG paths using Raphael:

https://github.com/kartograph/kartograph.js/blob/f70bd295fa8b763d771f923a91b09564040eada3/src/core/maplayerpath.coffee#L30

Raphael stores this data in a *global* map, keyed on the path's ID:

https://github.com/DmitryBaranovskiy/raphael/blob/fe8e591e1c86b5aeb4c252b33c08e647434504c5/raphael.js#L3168

https://github.com/DmitryBaranovskiy/raphael/blob/fe8e591e1c86b5aeb4c252b33c08e647434504c5/raphael.js#L306

UserCountryMap does the right thing and calls clear() on the Kartograph map to reclaim memory...:

https://github.com/piwik/piwik/blob/6fab62e2229f9efadbcf43ff541b46f007fc6323/plugins/UserCountryMap/javascripts/visitor-map.js#L1332

...which eventually calls `remove` on each of these SVG paths:

https://github.com/kartograph/kartograph.js/blob/f70bd295fa8b763d771f923a91b09564040eada3/src/core/maplayerpath.coffee#L70

However, previous versions of Raphael (including 2.1.0) fail to call `removeData` to clear out the data associated with the SVG path in the global map,
leading to a serious memory leak (heap grows by ~10MB each time the map refreshes):

https://github.com/DmitryBaranovskiy/raphael/blob/7ba1a8258be64fdb517bc78fde44ff0e6188ca05/raphael.js#L4475

Later versions, including the latest 2.2.1, properly call `removeData` when `remove` is called:

https://github.com/DmitryBaranovskiy/raphael/blob/master/raphael.js#L6842

* Properly remove window resize event listener for UserCountryMap

The previous version of the code inappropriately tried to remove the event listener;
the `function` object for `onResizeLazy` is different across maps.

* Prevent visitor-map from inserting a new CSS document into DOM every refresh.