Search Fields

Added a getSearchFields function to the Files, Pages, and Users search
controllers.

Output buffer no longer used when in the getField function for the
Files, Pages, and Users search controllers.

Updated the search elements for the Files, Pages, and Users to use the
new getSearchFields functions.
Fixed Code Formatting

Replaced tabs with spaces for PSR2 compliancy.
Merge branch 'develop' of https://github.com/ijessup/concrete5-5.7.0 into ijessup-develop