Version bump and changelog for 1.0-rc1

changes/changelog.d/1193.bugfix

-Fixed crash with negative track position in file tags (#1193)
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changes/changelog.d/292.enhancement

-Users can now update their email address (#292)
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changes/changelog.d/370.feature

-Dedicated, advanced search page (#370)
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changes/changelog.d/407.enhancement

-Confirm email without requiring the user to validate the form manually (#407)
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changes/changelog.d/858.enhancement

-Broadcast/handle rejected follows (#858)
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changes/changelog.d/996.feature

-Persist theme and language settings accross sessions (#996)
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changes/changelog.d/docker-installation-and-upgrade.doc

-Simplify Docker mono-container installation and upgrade documentation

changes/changelog.d/import-eaccess-fix.bugfix

-Handle access errors scanning directories when importing files

changes/changelog.d/logout.enhancement

-Add support for unauthenticated users hitting the logout page
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changes/changelog.d/search-page.bugfix

-Fixed an issue with search pages where results would not appear after navigating to another page
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changes/changelog.d/thunbnails.enhancement

-Increased quality of JPEG thumbnails