Minor coverity issue fixes

Minor coverity issue fixes

Fix some minor coverity issues that might has meanful

1. Implement missing move operation.
2. Remove float equal checks by ==, != operator.
3. Remove useless std::move.
4. Resolve type missed operator (use enum BufferState as bool)
5. Remove virtual operation in Constructor/Destructor.
6. Use referenced iterator so we don't copy value.
7. Remove cyclic header include (a.k.a render-task-list-impl.h -> render-task-impl.h -> render-task-list-impl.h)

Change-Id: If01bd4df71f0bc661a9fda10e668204cd35301ad
Signed-off-by: Eunki, Hong <eunkiki.hong@samsung.com>