Adapt new icons from Bitcoin 0.11 and optimize Splash screen
Motivation
It's a low priority task but takes time to merge it. So it can be done when we have more time and if it's necessary at that time.
Proposal
Pull requests to merge:
https://github.com/bitcoin/bitcoin/pull/5219
https://github.com/bitcoin/bitcoin/pull/5228
https://github.com/bitcoin/bitcoin/pull/5488
https://github.com/bitcoin/bitcoin/pull/5487
https://github.com/bitcoin/bitcoin/pull/5547
https://github.com/bitcoin/bitcoin/pull/5493
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