Store Infoelement Custompoint visibility state

Description

The visibility of the custompoint is controlled by the Infoelement to hide it when something is invalid. When the Infoelement gets valid again, the point shall be visible again only if the point was not set invisible automatically

Conformity

• [ ] Changelog entry
• Unit tests
• [ ] Update INSTALL
• [ ] Downport
• Fixes: #888 (closed)

When external dependencies are removed

• [ ] Reporting to ...