add changelog entries (#8922)

changelog_entries/8166_unit_type_editor.md

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+ ### Editor
+   * New UI in the Scenario Editor that allows to create custom unit types, accessible by Unit menu > New Unit Type.

changelog_entries/8390_new_widgets.md

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+ ### User interface
+   * new combobox and tab_container widgets
+   * editability in text box via the editable key
+

changelog_entries/8451_completion_filter.md

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+ ### User interface
+   * The campaign list in New Campaign dialog now supports filtering campaigns by whether they have been completed and at which difficulty.

changelog_entries/8539_aethermaw_prose_change.md

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+ ### Multiplayer
+   * In the Aethermaw map, Sulla's title has been changed to Aether Mage and prose slightly rewritten to include this change.

changelog_entries/8737_enchantress_sylph_changes.md

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+ ### Units
+   * Elvish Enchantress - description for 'entangle' changed to 'ethereal web', icon changed.
+   * Elvish Sylph - description for 'gossamer' changed to 'ethereal web'.

changelog_entries/8803_about_dialog.md

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+ ### User interface
+   * Game version dialog redesigned to act as an general purpose About dialog.
+   * Community dialog moved to About dialog as a new tab. Community button removed from title screen.
+   * Credits button moved from Title Screen into About dialog.
+   * Success indication mechanism on buttons. Currently used only for copy buttons.
+   * Slight reorganization of title screen buttons.