Bump version to 1.0.0 in CHANGELOG and finish migrating changelog to new  format
Bump version to 1.0.0 in CHANGELOG and finish migrating changelog to new  format

The PR https://github.com/robotology/idyntree/pull/608 was not complete as it left a lot of changes not under the categories https://keepachangelog.com/en/1.0.0/ .
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