Exclusion patterns in detekt-config

[schalkms]

As mentioned in #764 there should be an option to exclude rules for given patterns.
For instance:

exclusion-patterns:
  exclusion-pattern:
    pattern: .*DTO.kt
    rules:
      - VariableNaming
      - FunctionNaming

After this feature is implemented the config option excludeClassPattern in VariableNaming and FunctionNaming should be removed.

[schalkms]

This is already implemented.

TooManyFunctions:
  active: true
  excludes: "**/test/**,**/androidTest/**,**/*.Test.kt,**/*.Spec.kt,**/*.Spek.kt"