WIP: Rename caosdb -> linkahead

RELEASE_GUIDELINES.md

build.properties.d/00_default.properties

misc/entity_state_test_data.py

misc/ext_bottom_line_test_data.py

misc/ext_cosmetics_test_data.py

misc/install_comment_datamodel.py

misc/list_references_test_data.py

misc/map_test_data.py

misc/merge_js.sh

misc/query_shortcuts_test_data.py

misc/select_query_test_data.py

misc/test_entities/insert.py

misc/versioning_test_data.py

src/core/html/imprint.html

src/core/js/edit_mode.js

src/core/js/ext_cosmetics.js

src/core/js/ext_editmode_wysiwyg_text.js

src/core/js/ext_references.js

src/core/js/form_elements.js

src/core/js/linkahead.js