+ Beautification of the code
+ Change license header
+  update coypright header
+ fix wget version detetection
+ remove unused variable
+ Remove last traces of CLUCENE backend support
+ Add indexer destructor (to avoid compilation warning with "non-virtual destructor")
+ Use directly "KiwixIndexer" instead of "Indexer"
+ Stub class to store custom generic varia functions
+ use kiwix:sleep()
+ add kiwix::sleep() method
+ remove useless #include
+ Add necessary header includes
+ Use now kiwix::sleep(0
+ use now kiwix::sleep()
+ remove old backend stuff
+ Fix compilation warning
+ use kiwix::sleep()
Bump MaxVersion