Pymunk

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**Fix release**

This release contains a bunch of smaller fixes and improvements.

Changes:

- Fixed issue with PyInstaller onefile.
- Improved performance of Vec2d creation. Thanks Mikhail Simin!
- Handle debug drawing of springs with 0 length.
- Made bodies and constraints ordered when accessed from the space.
- Added Space.use_spatial_hash function to enable use of Spatial hash as its
spatial index which can improve performance when there's lots of similarly
sized objects.
- Fixed case when Vec2d.projection get a tuple as other paramter.
- Fixed ZeroDivisionError for Vec2d.projection. Thanks Mohamed Saad Ibn Seddik!
- Fixed return type of Shape.center_of_gravity property (now returns Vec2d
instead of cdata).
- Fixed issue when installing dev dependencies.
- Added chipmunk tank example (available in examples folder).
- Improved docs.

Heads up! A major update to Pymunk is on the way that will be released as
Pymunk 6.0. It will contain big changes, some of them very API breaking, and
it will also drop support for Python 2.

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**Fix to avoid incompatible CFFI version**

The main goal of this release is to ensure a compatible version of CFFI is
installed when installing Pymunk though pip. Unfortunately there is a problem on
Linux with CFFI 1.13.1. (Later and earlier versions will work fine)

Changes:

- Added a requirement on CFFI to not be 1.13.1 (since 1.13.1 doesnt work).
- Update cffi definitions to prevent deprecation warning in latest cffi.
- Added normal property to Arbiter object.
- Remove compiled docs from committed code.
- Removed build/test of CPython 3.4 from Travis and Appveyor configs since its
not supported anymore.
- Update pyglet examples to work with pyglet 1.4.
- Fixed minor issue in platformer example.
- Improved docs.

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**Updated Chipmunk version, FreeBSD, Android/Termux support and more!**

This release contains a number of improvements. Chipmunk was updated to the
latest version, and then a number of unmerged PRs were merged in. (The
Chipmunk git repo is quite dead, so Pymunk will include unmerged PRs after
manual review). Another major improvement is that now Pymunk can run on
FreeBSD. It was also tested on Termux on Android, and several improvements to
the installation process has been included. A bunch of smaller fixes are also
included.

Changes:

- Update Chipmunk to 7.0.2 + unmerged PRs
- Pymunk can be installed and run on FreeBSD
- Pymunk can be installed and run on Termux on Android
- Fix debug drawing of polygons with radius
- Improved debug drawing of segments on pygame
- Fix problem when installing without wheel package installed
- New Constraints demo
- Improved docs

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**Fix for chipmunk.dll load troubles on windows**

This release fixes a problem on Windows that made the chipmunk.dll file depend
on libwinpthread-1.dll which happened in Pymunk 5.4.1 because of the new build
setup. The fix means that for now the threaded solver is disabled on Windows.
In practice this should not be a big problem, the performance benefit of the
threaded solver on a desktop running windows is unclear.

Changes:

- Disable threaded solver on Windows.

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**Improved packaging**

This release consists of a number of fixes to the packaging of Pymunk. One fix
that will allow building for conda, and a number of changes to build binary
wheels on linux.

Changes:

- Fixes to help Pymunk work with freezers such as cx_Freeze.
- Better wheels, now they contain the proper tags
- Fix problems using custom CFLAGS when compiling chipmunk

Enjoy!

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