GH-37: Registered 'Close All Editors' command and its key binding.
GH-37: Registered 'Close All Editors' command and its key binding.

Signed-off-by: Akos Kitta <5adc53eb8928d8424ddf49bf102dba40aa33cffe@gmail.com>
hexa00/theia,lmcgupe/theiagreenkeeperTest,hexa00/theia,lmcgupe/theiagreenkeeperTest,lmcgupe/theiagreenkeeperTest,epatpol/theia-1,epatpol/theia-1,lmcgupe/theia,lmcgupe/theia,epatpol/theia-1