Use scenarios in exercises

[AydinHassan]

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[AydinHassan]

• Migrate to php-cs-fixer #296
• Remove temporary solution mapper #294
• Remove useless code #293
• Update events to use context #292
• Use context in checks #290
• Use context objects in dispatcher and runners #289
• Use scenarios in exercises #291 👈
• Introduce new class to prepare environment files #295
• Reorganise event hiearchy #287
• Use new process factory #286
• Seperate listeners and checks #285
• Add context objects #281
• Introduce exercise scenario objects #284
• Ignore line length checks #288
• master

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Merge activity

• May 17, 2:38 AM EDT: Graphite rebased this pull request after merging its parent, because this pull request is set to merge when ready.
• May 17, 2:38 AM EDT: @AydinHassan merged this pull request with Graphite.