- fix: data read from Data/AdditionalProperties,
- new tag: <bTrapBonus> + updated data for tiles, trap level influenced by terrain,
- new feature/option: COVER_SYSTEM_STATIC_SHADOWS_DECREASE_BRIGHTNESS.
git-svn-id: https://ja2svn.mooo.com/source/ja2_v1.13_data@1972 4f8fa57e-7814-0410-bad4-adc449f26b7c