Custom heightmap color scheme

[Azgaar]

Description

Allow to create custom heightmap color scheme via Style tab and a new dialog.

Type of change

• [ ] Bug fix
• [x] New feature
• [ ] Refactoring / style
• [ ] Documentation update / chore
• [ ] Other (please describe)

Versioning

• [x] Version is updated
• [x] Changed files hash is updated

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