Merge branch 'release/0.12.30' into develop
fix version for next step development
fix ec configuration
refactor rendering test mechanism for better test support
fix wrong spelled method name(eable => enable)
wrote english docs
fix intro
fix bug: predefined clear nodes are not removed correctly
fix constant name
write doc
write doc
write doc
write doc
write doc
fix doc structure
write doc
write list render test in a more functional way
write doc
fix book info
write doc