update swig to 3.0.12

[breznak]

Fixes #1293

Replaces #1318

TODO:

• fix swig for windows

[breznak]

Windows is causing troubles:

[ 71%] Built target Swig
[ 71%] Swig source
(1) : Error: Unable to find 'swig.swg'
(3) : Error: Unable to find 'python.swg'

Here https://ci.appveyor.com/project/numenta-ci/nupic-core/build/0.3.0.2226/job/22yglo6elbtw1u80#L1358

And the solution can be found

Known Issues
============
There are minor known bugs, details of which are in the bug tracker, see
http://www.swig.org/bugs.html.

Troubleshooting
===============
In order to operate correctly, SWIG relies upon a set of library
files.  If after building SWIG, you get error messages like this,

    $ swig foo.i
    :1. Unable to find 'swig.swg'
    :3. Unable to find 'tcl8.swg'

it means that SWIG has either been incorrectly configured or
installed.  To fix this:

    1.  Make sure you remembered to do a 'make install' and that
        the installation actually worked.  Make sure you have
        write permission on the install directory.

    2.  If that doesn't work, type 'swig -swiglib' to find out
        where SWIG thinks its library is located.

    3.  If the location is not where you expect, perhaps
        you supplied a bad option to configure.  Use
        ./configure --prefix=pathname to set the SWIG install
        location.   Also, make sure you don't include a shell
        escape character such as ~ when you specify the path.

    4.  The SWIG library can be changed by setting the SWIG_LIB
        environment variable.  However, you really shouldn't
        have to do this.

If you are having other troubles, you might look at the SWIG Wiki at
https://github.com/swig/swig/wiki.

EDIT:
MinGW link https://aliowka.wordpress.com/2010/07/09/creating-python-extensions-in-cc-with-swig-on-mingw-gcc-under-windows/

[breznak]

This commit moves us from

#1321 (comment)
to
https://ci.appveyor.com/project/numenta-ci/nupic-core/build/0.3.0.2227/job/hcx4ji7p9s5pbg0i#L1357

@rhyolight do you know someone on Windows who can look into the swig paths? Where the new swig binary is located and what paths it expects

[lscheinkman]

@breznak I added windows support to your branch with this PR breznak#3
Here is the windows build log:

• https://ci.appveyor.com/project/lscheinkman/nupic-core/build/0.3.0.3/job/fq7cop9ipp4929bf

CC: @rhyolight

[breznak]

Fixing windows side of the new swig ... Help wanted

[lscheinkman]

see breznak#3

[breznak]

Thank you @lscheinkman for the Win fix!
EDIT 2:
@rhyolight some "web-flow guy" is not passing the Contributor Validation check ...aand it's gone after the comment, nice 😉 still there

Contributor Validator — web-flow must sign the Contributor License