Add changelog for the first stable release

Add changelog for v0.7.1

Set main window as master and use SetOnClosed() instead of defer

This should hopefully be a small optimization by running the function on close instead of defering it and keeping it in the call stack.

Smaller spelling fixes for CHANGELOG.md

Update change for 0.4.1 to 0.5.0

The 0.4.1 update was broken and got removed while it evolved into the 0.5.0 update instead.

Fix spelling msiatke in changelog and correct MacOS zip file

Merge branch 'master' of github.com:Jacalz/sparta

Update gui and add support for all the data fields

Automate release file build and remove readme info on the matter

Add fyne-cross stuff into gitignore and update README