Replaces imutable strings ops with string buffers

Registered by Eyal Wiener

MBEngine.sortItemsByRelevancy() do a lot of work on immutable strings to build query regular expressions and this might affect memory and speed during run time.
It might increase performance if we change it to string buffers.

Blueprint information

Status:
Not started
Approver:
Eyal Wiener
Priority:
Undefined
Drafter:
Eyal Wiener
Direction:
Needs approval
Assignee:
None
Definition:
New
Series goal:
None
Implementation:
Unknown
Milestone target:
None

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