docs: Update changelog for v0.15.0
Release v0.15.0
Bump version to 0.15.0
doc: Remove duplicate "Extension configuration" section in config.rst
Merge pull request #518 from ZenithDK/lb-test

doc: Remove duplicate "Extension configuration" section in config.rst
Merge branch 'develop' into tidy-up-core
Merge branch 'tidy-up-core' into tracklist-provider