Raise the version number to 1.3.0

Description

Changes the version number to 1.3.0.

Changes

• The build.gradle version is upgraded to 1.3.0
• The hardcoded settings IntelliJ uses are also changed so the startup art and the UI while developing are a bit more sensible

Additions

ничего

Test and Review

To be filled in by the reviewers

• There are no unnecessary files present in the MR

• The continuous integration has no problems with the MR

• The MR is filled in as requested (including labels, milestones, and reviewers)

• The documentation is up-to-date