Installer script improvement

[bovirus]

@Klocman

I updated the script to get automatically some info without need to modify them manuall

• Copyright year (used in Copyright message) get from current date
• AppVersion and AppVersionShort get automatically by main exe file

Thanks.

[Klocman]

I didn't even know ParseVersion existed, thank you for the PR!

[bovirus]

@Klocman

ParseVersion is sued when you don't use full build version xxx.xxx.xxx.xxx (4 numeric group).
If you use xxx.xxx.xxx.xxx there are other easier way to get version in Inno Setup.