Release 1.8.0 (#761) * bump version to 1.8.0 * Update CHANGELOG.md * Fix version tags in deprecated messages * fix version in old deprecation messages * Fix typo see comment from @jtojnar in #752 * Add comment for DataCache interface see comment from @jtojnar in #752 * Update CHANGELOG.md for #760, #764 and #765 * Update CHANGELOG.md for #762, #767 and #763 * Update CHANGELOG.md for #768 and #770 * Update release date * Update CHANGELOG.md for #769 and #771 * Update CHANGELOG.md for #766