Inspector: add sassdoc for x-inspector--toolbar-header
Inspector: refactor long line
Module: store module name at the definition
Module: make bool type in sassdoc consistent
Module: add functions related to parent module
Varible: fix bug of x-is-string()
Variable: add x-is-empty()
Variable: add x-is-blank()
add Selector module
Module: modifier shoul be the child of a simple class selector/placeholder
List: trim trailing colon from sassdoc