refactor(appinfo)!: improve application models

changelog/695.breaking.rst

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+Refactor application models:
+- :class:`AppInfo` now inherits from :class:`PartialAppInfo`, new type :class:`BotAppInfo` (corresponds to old ``AppInfo``) inherits from :class:`AppInfo`.
+  As a result of this, attributes that were previously present in :class:`PartialAppInfo` are now only in :class:`AppInfo`.
+  This should not have any noticeable effect unless you're instantiating these types yourself.
+- Remove deprecated attributes :attr:`BotAppInfo.summary`, :attr:`AppInfo.summary`, and :attr:`IntegrationApplication.summary`.
+- :attr:`AppInfo.bot_public` and :attr:`AppInfo.bot_require_code_grant` are now optional.
+- :attr:`Message.application` is now a :class:`PartialAppInfo` object instead of a :class:`dict`.
+- :attr:`IntegrationApplication.icon` is now an :class:`Asset`.

changelog/695.bugfix.rst

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+Fix broken :attr:`PartialAppInfo.cover_image` url.

changelog/695.feature.rst

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+Improve application models:
+- Add previously missing attributes to :attr:`Invite.target_application`.
+- :attr:`AppInfo.rpc_origins` is no longer optional.
+- Add :attr:`IntegrationApplication.cover_image`.