py3/namecoin 0.19 updates

py3/pyside2 compat
namecoin 0.19 support
persistence layer
signing process split into timestamp/publish

Source code release fix

This release fixes Makefile in source release. No changes in Windows build.

About dialog and updater

Added about dialog and update checker. Slightly smaller binary as well.

GUI updated

Just a tiny GUI update.

Replace Namecoin Core with Namecoin Legacy

This seems to be mostly-almost-fully usable out of the box now.

Random fixes

Changes

• Add support for Namecoin Core 0.13.99
• Fix worker lockup caused by python logging
• Embed Namecoin Core installer and initial configuration setup
• Random installer fixes
• Add chainsign_debug.exe binary

Another testing Windows release

Changes

• Build slightly compacted
• Added support for cookie authentication
• Display error windows on exceptions
• Show error when namecoin config file is missing.

Testing release

This is just a testing Windows build.