Update copyrights and standardize license
Update copyrights and standardize license

It was "LGPL" before, now it is LGPLv2.1+ as we have permission from the
copyright holder

BueVest/liblouis,IndexBraille/liblouis,BueVest/liblouis,hammera/liblouis,liblouis/liblouis,hammera/liblouis,vsmontalvao/liblouis,liblouis/liblouis,vsmontalvao/liblouis,liblouis/liblouis,hammera/liblouis,BueVest/liblouis,BueVest/liblouis,IndexBraille/liblouis,vsmontalvao/liblouis,IndexBraille/liblouis,liblouis/liblouis,hammera/liblouis,IndexBraille/liblouis,liblouis/liblouis,vsmontalvao/liblouis,BueVest/liblouis,IndexBraille/liblouis,BueVest/liblouis,hammera/liblouis,liblouis/liblouis,vsmontalvao/liblouis,hammera/liblouis