Add missing copyright statement
[Cleanup]
Update .gitignore file
Added warning-header to CMake files generated for IDLs
Added warning-header to "_common.h" Thrift-generated files
Fixed wrong copyright notice in Thrift examples
Fixed other copyright notices in Thrift examples
fix typo: iCub Platform -> iCub Facility
Fix some copyright statements
Clean release scripts and prepare them for the next release
Regenerate COPYING file
YARP 2.3.21