fixing inconsistent white space
adding view from file slicer
added perforce polling view mask slicer

not super robust, it would probably be worth adding a slice type that
let you select some jobs and them see the actually jelly page for
configuring parts of them. Maybe that's a whole other plugin
removing the isIndexUsed() override

you can't support multiple perforce SCM like you can build executors so
don't try to
adding perforce use stream slicer