fix(labels): Fix overlapping max and ceil labels in some cases

fix angular-slider#396

fix(labels): Refactor autoHiding algorithm for labels

fix angular-slider#446

chore(dist): Generate a SCSS file (simple copy of the css file) in th…

…e dist folder so it can be impo

fix(labels): Fix ceil label positioning

Was broken by d19a4dd commit

Close angular-slider#448

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