GitLab

Add EmitterStyle, which will allow sequence or map style (i.e., flow or block) to be preserved between parsing and emitting

Add yaml-cpp-config.cmake and yaml-cpp-config-version.cmake files for importing yaml-cpp into external projects (through find_package).

Fix clang compiler settings, and properly set up warnings so they don't interfere with gtest and gmock

Merge from core, and update several missing DLL exports. This does not resolve them all (in particular, node_data::equals seems to be still missing, even though it is inlined in a header, which seems strange).