Adding project branch case insensitive matching.
We were seeing issues with reviews not being assigned to projects if there was a case
issue in either the project branch depot path or the files in the review.
This patch forces project branch paths to be matched case insensitive. This is
useful for case insensitive Perforce servers when Swarm is run from Linux.
The underlying P4PHP P4_Map class is case sensitive when run on Linux platforms.