Add support to check updates

[Lihis]

Windows does not have package manager so the program itself should check for updates. Having an update checking the users would more likely have an up-to-date version of the program.

This could be implemented by using Github API to check for new stable releases. If newer stable release is found then the installer could be downloaded and ran.

Other possiblity would be to use Advanced Installer as it would have built-in support for automatic updates (see here).