Plone.app.theming

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Fixes:

- Updated Site Setup link in all control panels.
Fixes https://github.com/plone/Products.CMFPlone/issues/1255
[davilima6]

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Fixes:

- Do not fail in ``isThemeEnabled`` when we have no settings, for
example when migrating from Plone 3 to Plone 5, but maybe also in
other cases.
[maurits]

- Fixed Unicode Encode Error when to copy into multi-byte title / description
[terapyon]

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- Fix i18n in mapper.pt
[vincentfretin]

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- Pull mark_special_links, external_links_open_new_window values
from configuration registry.
[esteele]

- Fix visual glitch on Safari
[davilima6]

- Show active theme at the top of the theme list.
Fixes https://github.com/plone/plone.app.theming/issues/70
[tmassman]

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- Remove bundled twitter bootstrap theme 'example'.
Fixes https://github.com/plone/Products.CMFPlone/issues/877
[pbauer]

- Remove duplicate type attribute for theming control panel delete modal.
[esteele]

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- rewrite manifest from copied theme with relative paths also
[vangheem]