Version 0.3

Changes in this release:

• Updated documentation for Solar
• INI: sections with syntax errors are now dropped
• formats.ini.parse is now cached
• DLL: new function lookup_as_plain
• Entity: infocard parameter changed
• Entity and subclasses are now data classes from dataclassy rather than dataclasses
• Group has been renamed to Faction; get_groups has been renamed to get_factions
• Faction: ids_short_name field and short_name method added
• Base: system_ method added