Functional rebrand for Wisp wallet. Images, translations, legacy code…

[DrStrife]

Release Notes: -Updated necessary ports -Rebrand Context of wallet assets and documentation -Using Qt WebKit rather than Qt WebEngine

[bitcoinx2]

Hi DrStrife, thanks a lot for your contribution! There are a couple of things that could be improved here:

• Separate everything rebrand-related from other changes
• Changes that are not related to the rebrand do not belong into the "rebrand" branch. The idea of feature branches is to make separate branches for every larger feature that can be developed independently. So functional changes that go beyond the purpose of a rebrand should be merged on some different development branch.
• Use smaller commits for the rebranding if possible, e.g. separate UI changes from functional changes, to make debugging easier
• If you merge upstream changes, please do so via Git and don't duplicate the changes. This makes things more reproducible for other developers and gives credit to the original developer who made the change. See https://stackoverflow.com/questions/5120038/is-it-possible-to-cherry-pick-a-commit-from-another-git-repository
• Please separate format changes (removing unnecessary spaces, newlines etc.) from other changes to keep the relevant commits small.