CBuffer: Use std::deque instead of std::vector
CBuffer: Use std::deque instead of std::vector

deque got constant time removal of elements at the beginning of the sequence,
vector doesn't. The plan is that this saves some CPU time in CBuffer::AddLine()


git-svn-id: 3ad904ec35b89a071badd9cb0113dfe58093e920@1532 726aef4b-f618-498e-8847-2d620e286838

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