Merge branch 'refs/heads/release-3.0' into develop
Change version in BasisProject.cmake for develop back to "0.0.0".
Issue #254 make BASIS logo.svg square
Issue #254 create BASIS website favicon.ico
Issue #293 Add HTML_FAVICON option to basis_add_sphinx_doc.
Issue #254 Use BASIS logo in .ico format as html_favicon.
Issue #254 Replace favicon.ico by one of size 256x256.
Merge remote-tracking branch 'github/develop' into release-3.0
Change version number again to 3.0.0. Got lost after merge.