Add support for embed flags and update attachment flags

Co-authored-by: Danny <1695103+Rapptz@users.noreply.github.com>

discord/flags.py

@@ -63,6 +63,7 @@ __all__ = (
     'RoleFlags',
     'AppInstallationType',
     'SKUFlags',
+    'EmbedFlags',
 )
 
 BF = TypeVar('BF', bound='BaseFlags')
@@ -2173,6 +2174,30 @@ class AttachmentFlags(BaseFlags):
         """:class:`bool`: Returns ``True`` if the attachment has been edited using the remix feature."""
         return 1 << 2
 
+    @flag_value
+    def spoiler(self):
+        """:class:`bool`: Returns ``True`` if the attachment was marked as a spoiler.
+
+        .. versionadded:: 2.5
+        """
+        return 1 << 3
+
+    @flag_value
+    def contains_explicit_media(self):
+        """:class:`bool`: Returns ``True`` if the attachment was flagged as sensitive content.
+
+        .. versionadded:: 2.5
+        """
+        return 1 << 4
+
+    @flag_value
+    def animated(self):
+        """:class:`bool`: Returns ``True`` if the attachment is an animated image.
+
+        .. versionadded:: 2.5
+        """
+        return 1 << 5
+
 
 @fill_with_flags()
 class RoleFlags(BaseFlags):
@@ -2308,3 +2333,67 @@ class SKUFlags(BaseFlags):
     def user_subscription(self):
         """:class:`bool`: Returns ``True`` if the SKU is a user subscription."""
         return 1 << 8
+
+
+@fill_with_flags()
+class EmbedFlags(BaseFlags):
+    r"""Wraps up the Discord Embed flags
+
+    .. versionadded:: 2.5
+
+    .. container:: operations
+
+        .. describe:: x == y
+
+            Checks if two EmbedFlags are equal.
+
+        .. describe:: x != y
+
+            Checks if two EmbedFlags are not equal.
+
+        .. describe:: x | y, x |= y
+
+            Returns an EmbedFlags instance with all enabled flags from
+            both x and y.
+
+        .. describe:: x ^ y, x ^= y
+
+            Returns an EmbedFlags instance with only flags enabled on
+            only one of x or y, not on both.
+
+        .. describe:: ~x
+
+            Returns an EmbedFlags instance with all flags inverted from x.
+
+        .. describe:: hash(x)
+
+            Returns the flag's hash.
+
+        .. describe:: iter(x)
+
+            Returns an iterator of ``(name, value)`` pairs. This allows it
+            to be, for example, constructed as a dict or a list of pairs.
+            Note that aliases are not shown.
+
+        .. describe:: bool(b)
+
+            Returns whether any flag is set to ``True``.
+
+    Attributes
+    ----------
+    value: :class:`int`
+        The raw value. You should query flags via the properties
+        rather than using this raw value.
+    """
+
+    @flag_value
+    def contains_explicit_media(self):
+        """:class:`bool`: Returns ``True`` if the embed was flagged as sensitive content."""
+        return 1 << 4
+
+    @flag_value
+    def content_inventory_entry(self):
+        """:class:`bool`: Returns ``True`` if the embed is a reply to an activity card, and is no
+        longer displayed.
+        """
+        return 1 << 5