compact, effective and beautiful coding editor

Changes for 0.405 - 2023-10-14

• = more settings
• * config under ~/.config/kephra/main-recent.yaml stores most intern vars
• + document menu with 4 items: soft tabs, tab size, EOL
• + toggle caret line visibility
• ! expand selection can handle touching brace pairs
• ! cursor pos in status bar shows correct line nr now
• ! can cancel file dialogs