Vendor discord.ext.menus (#4039)

Vendor `discord.ext.menus` from commit `cc108bed812d0e481a628ca573c2eeeca9226b42` at https://github.com/Rapptz/discord-ext-menus

Co-authored-by: jack1142 <6032823+jack1142@users.noreply.github.com>

LICENSE

@@ -700,3 +700,6 @@ AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 THE SOFTWARE.
+
+This project vendors discord.ext.menus package (https://github.com/Rapptz/discord-ext-menus) made by Danny Y. (Rapptz) which is distributed under MIT License.
+Copy of this license can be found in discord-ext-menus.LICENSE file in redbot/vendored folder of this repository.

README.md

@@ -126,3 +126,6 @@ Red is named after the main character of "Transistor", a video game by
 
 Artwork created by [Sinlaire](https://sinlaire.deviantart.com/) on Deviant Art for the Red Discord
 Bot Project.
+
+This project vendors [discord.ext.menus](https://github.com/Rapptz/discord-ext-menus) package made by Danny Y. (Rapptz) which is distributed under MIT License.
+Copy of this license can be found in [discord-ext-menus.LICENSE](redbot/vendored/discord-ext-menus.LICENSE) file in [redbot/vendored](redbot/vendored) folder of this repository.

docs/version_guarantees.rst

@@ -17,7 +17,7 @@ Guarantees
 Anything in the ``redbot.core`` module or any of its submodules 
 which is not private (even if not documented) should not break without notice.
 
-Anything in the ``redbot.cogs`` module or any of it's submodules is specifically
+Anything in the ``redbot.cogs`` and ``redbot.vendored`` modules or any of their submodules is specifically
 excluded from being guaranteed.
 
 Any RPC method exposed by Red may break without notice.

pyproject.toml

@@ -14,5 +14,6 @@
         | buck-out
         | build
         | dist
+        | redbot\/vendored
     )/
     '''

redbot/vendored/discord-ext-menus.LICENSE

@@ -0,0 +1,21 @@
+The MIT License (MIT)
+
+Copyright (c) 2015-2019 Danny Y. (Rapptz)
+
+Permission is hereby granted, free of charge, to any person obtaining a
+copy of this software and associated documentation files (the "Software"),
+to deal in the Software without restriction, including without limitation
+the rights to use, copy, modify, merge, publish, distribute, sublicense,
+and/or sell copies of the Software, and to permit persons to whom the
+Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+DEALINGS IN THE SOFTWARE.