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Changed when select2Functions.js is loaded
#K69

* Don't rely on CDN for JS
* Consistent defaults
* Refactor a bit logging function
* Removed useless test
* Fixed typo
* Bug fix on embedded
* Added param for Access-Control-Allow-Origin header
* Use legacy 'data' field for searches

This allows to define multiple additional configuration-dependant strings for
templates, especially useful in multi-tenants setup.

- config files are now in etc subdirectory
- web files are now in www subdirectory
- library files are now in lib subdirectory
- script files are now in bin subdirectory

Updated year of copyright info

Minor code restructing for #3139

Logging now contains instance identifier

Updated year in copyright
Some minor code refactoring

Added new setting $showNumOfPreviouslyUsedIdPs to standalone and embedded WAYF. Shows last used n IdPs at top of drop-down list
Outsourced Embedded WAYF JS into own file
Logos are now also shown for IdPs from Discovery feed
Refactored some code

Improves fix for #2596

Added additional data protection feature that uses the referer to decide whether or not to preselect an Identity Provider in the Embedded WAYF
If the Discovery Feed feature is activated only those IdPs are shown that are contained in the feed. Others will be hidden automatically.
Added code to automatically set default proper values in case there are not defined in the configuration
Added improved drop-down feature with search as you type functionality
Added licenses of added libraries