Add command line argument noraise

This path add new command line argument noraise. Window will not be raised with argument noraise.

I tried:
okular
okular -noraise
okular -noraise file_exist.pdf
okular -noraise file_not_exist
okular https://bugs.freedesktop.org/attachment.cgi?id=46889 --noraise
okular https://nonexisturl --noraise
okular -unique -noraise file_exist.pdf
okular -unique -noraise file_exist.pdf && okular -unique file_exist2.pdf
okular -unique -noraise file_exist.pdf file_exist2.pdf
okular -unique file.pdf && okular -unique -noraise file2.pdf
okular -unique -noraise file.pdf && okular -unique file2.pdf

BUGS: 315538
REVIEW: 109363
FIXED-IN: 4.11.0
Add documentation for noraise command line option