Release v0.7.0

Summary | 概述:
libkazv v0.7.0 most importantly fixes a security bug in the attachment
encryption that could potentially lead to a known-plaintext
attack. See https://iron.lily-is.land/D153 for more details.
    
It also implements calculating local notifications and adds helper
functions to pin and unpin events in a room. Documentation is also
updated to reflect the current status of libkazv, and to add a
introduction of the architecture of libkazv.

Type | 类型: skip

Test Plan | 测试计划: N/A


GitLab Merge Request: kazv/libkazv!80