* Add the property "contentType" to the SSX objects
* SSX objects can handle LESS code
* Create Skin and Color Theme references
* Continuing the refactoring of the LESS module to be able to compile LESS resources that are not files
* Lot of tests done locally in addition of unit tests, that is why I allow myself to low down the jacoco requirement, with the ambition to write new tests in the following weeks.

* First implementation of SSX using LESS.
* Todo: a cache cleaner when a SSX is saved.

* Big refactor

This reverts commit 29007de3.

First step: adding, in the LESS Cache, the support of entities (EntityReference) that can contain LESS code.

XWIKI-11528: Office viewer fails if the page where the file is attached has a special character in the name (whitespace)
* There's no need to double encode the file path because the 'temp' action uses it as is to access the temporary file. Moreover the double encoding seems to cause problems when mode_proxy is used (with 'nocanon' option disabled).

* Escape bug fixed.

* Update the hint.

* Bug fixes.

XWIKI-11528: Office viewer fails if the page where the file is attached has a special character in the name (whitespace)

- Using the same algorithm to display the table header

- Filtring out Password fields

XWIKI-11528: Office viewer fails if the page where the file is attached has a special character in the name (whitespace)

Todo: change the hint of the field to not display anymore a link to the silk gallery.

Revert "XWIKI-11528: Office viewer fails if the page where the file is attached has a special character in the name (whitespace)"

This reverts commit 2e357249.

* update clirr

XWIKI-11528: Office viewer fails if the page where the file is attached has a special character in the name (whitespace)

XWIKI-11488 All time activity data ends in 2013

* the activity chart should display the last 5 years (2 years in the future will bring no information for the user since they will be empty)

* display the last 5 years to add consistency with the chart Stats.AllTimeActivity

* Minor doc improvement

* Typo