* py2exe only supports Major.Minor.Patch(.Revision), so pass only
Major.Minor.Patch to it. 'File version' of generated EXEs will have
a `.0` appended as .Revision.
* Set 'product_version' in py2exe with the full version string. This
ends up in the EXE 'Product version' property.
* WinSparkle accidentally suppoorts semver -prerelease correctly, but
not +buildmetadata. So trim the latter off and set that as the version
for checks.
* When I changed 'company_name' in setup.py to 'EDCD' this caused WinSparkle to
store, and look for, its keys there.
* There's code in config.py that attempts to set some WinSparkle options, only
if they weren't already there. This is hardcoded to use the old 'Marginal'
Registry Key.
So, explicitly do this WinSparkle setup under 'EDCD', and *always* set the
update_interval value to match what we expect. Leave the 'CheckForUpdates'
under the 'is it already here?' check so that we respect the user's choice.
* Re-uses the 'About {APP}' that was defined because the MacOS version
always had an 'About' bit.
* As a side effect of wanting the copyright string in the popup this is
now defined in config.py, and setup.py has been adjusted to also take
it from there.
* The About popup includes a link to the release notes, contingent on
the git tag existing on github.
* Only one instance of the popup is allowed at once.
* There's still a 'TODO' for moving 'Check for updates' into this
popup.
Addresses issue #509
First pass utilising 'futurize' to do most of the work.
There's an issue with ur'\"' in l10n.py which I'm not sure how to
properly fix.
This now has errors when hitting the 'Update' button.
