[worksheet] text alignment (left, center, right, block) in text labels.

Description

Implemented text alignment (left, center, right, block) in text labels.

At the moment it's not possible to align a multi-line text properly and the user has to work with white spaces to align centrally, etc. With this improvement we allow the user to quickly align the text via the formatting buttons in the properties widget for text labels.

text_alignment

Conformity

• Changelog entry
• Unit tests
• Update INSTALL
• Downport
• Fixes:

When external dependencies are removed

• Reporting to ...