Add desktop_linux_privilege_escalation module
Small bugfix (incorrect filename in data directory)
Removed redundant string "linux_" from exploit name
Converted LD_PRELOAD library from precompiled binary to metasm code.
Removed binary files from pull request (the code has already been converted to metasm)
Update from upstream
Do style cleaning on metadata
Use single quotes when possible
Clean exploit method
Clean get_restart_commands
Check payload
Do minor c code cleanup
Beautify restart_command creation
Land #3695, @jakoblell linux desktop privilege escalation

* through screensavers / policykit user component hijacking