Introduce exercise scenario objects

[AydinHassan]

Introduce DTO's which describe the exercise scenario. Will be used by exercises in the future instead of getArgs(), getRequests() etc.

We also can use it to define files which should be created in the execution directory.

[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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