Beta-1.0.0-b75

What's Changed

• fix(MessageBodyView): ShimmerView only visible when needed by @adrien-coye in #808
• Split base64 encoding and added unit tests by @adrien-coye in #807
• fix: Prevent keeping apiFetchers on logout by @PhilippeWeidmann in #809
• fix(Attachments): Use contentId != nil instead of disposition == .inline by @PhilippeWeidmann in #810
• fix: Correctly update mailbox unreadcount by @PhilippeWeidmann in #813
• fix(Thread): Log incoherent message date by @PhilippeWeidmann in #812
• feat: fix glitchy loading view by @adrien-coye in #815

Full Changelog: Beta-1.0.0-b74...Beta-1.0.0-b75