[Meta] 2.4

[pascalduez]

WIP

• Poster annotations override @todo from file level annotations getting overwritten #387, Add overwritePoster flag to annotations #410
• Docs for poster annotations override Update doc for new todo behaviour sassdoc.github.io#120
• Try to infer default values when compiling Add ability to infer default values when compiling #304
• Update linting [WIP] Update linting #400, Update to latest version of eslint and babel-eslint  #414, Switch to standard  #447
• Colour variables references Colour variables references sassdoc-theme-default#78
• Docs for sassdoc-extras resolved values (2.4.0) [RFR] Add extras resolveVariables filter documentation sassdoc.github.io#123
• Document CSS context parsing Document CSS context parsing sassdoc.github.io#126
• Add annotation aliases unit tests Add annotation aliases unit tests #446
• ...