v2021.2.8

• Addition of new job types to Q-Chem IO (@espottesmith, #2055),
  note metal_edge_extender has been moved into local_env for this change
• Improvements to string utils, new Stringify mixin with
  to_pretty_string(), to_latex_string(), to_unicode_string(), to_html_string() (@shyuep)
• Improvements to build system (@shyuep, @ltalirz, see #2046)
• Entry is now immutable, removing "in_place" option for normalize (@mkhorton, @mattmcdermott, #2060)
• Bug fix for co-ordination geometry finder (@davidwaroquiers, #2035)
• Bug fix for GibbsComputedStructureEntry (@mattmcdermott)