5.3.0
Merge branch 'master' into next-to-master
fix(zlevel): optimize zlevel allocate for effect series
chore: only output warning once when `setOption` is called, no matter how many tooltips are provided.
style: using utility methods for type checking.
refact: put all core modules in the core dir. only do export in lib/echarts
feat(state): add emphasis.disabled
fix(colorBy): support only series and data
chore(prepublish): transform __DEV__ to node env expr.
fix: [parallel] fix that the second category parallel axis can not be selectable.