This updates all Python packages that download their source from PyPi to
use pypi.mk.

This will allow future improvements/changes to pypi.mk to affect all
relevant packages.

This also makes it easier for future Python packages to start using
pypi.mk, when it's clear how it is used in existing packages.

Signed-off-by: Jeffery To <jeffery.to@gmail.com>

- Change URL of the website and for PKG_SOURCE_URL
- Change TITLE and description
- Remove PKG_BUILD_DEPENDS, PKG_UNPACK as they are not necessary
- Add src package

Signed-off-by: Josef Schlehofer <pepe.schlehofer@gmail.com>

This guarantees for the package feeds that
the mk files will always be available for all packages.

Will need to see about external-feed Python packages
a bit later.

Signed-off-by: Alexandru Ardelean <ardeleanalex@gmail.com>

Signed-off-by: Daniel Golle <daniel@makrotopia.org>