Review license / copyright on all files (1st round)
fixes 5818 - Dev Shell - Cmd Tab Completion
Meant to have show_recordings here. Ticket #5657
correct function name. Ticket #5657
A couple more refinements for pfSsh.php while I'm here.
Fix validation of playback file passed to pfSsh.php. Fixes #5657
Move main pfSense content to src/