(cake-contribGH-450) Add option to configure issue filters for writing comments to pull requests (cake-contrib#452)

Author: pascalberger

docs/configuration.md

@@ -72,6 +72,7 @@ By default [Cake.Git addin] will be used.
 | `IssuesParameters.PullRequestSystem.`<br/>&nbsp;&nbsp;&nbsp;&nbsp;`MaxIssuesToPostAcrossRuns`                                    | `IssuesContext.Parameters.PullRequestSystem.`<br/>&nbsp;&nbsp;&nbsp;&nbsp;`MaxIssuesToPostAcrossRuns`                                    | `null`        | Global number of issues which should be posted at maximum over all issue providers and across multiple runs. Issues are filtered by priority and issues with a file path are prioritized. `null` won't set a limit across multiple runs. |
 | `IssuesParameters.PullRequestSystem.`<br/>&nbsp;&nbsp;&nbsp;&nbsp;`MaxIssuesToPostForEachIssueProvider`                          | `IssuesContext.Parameters.PullRequestSystem.`<br/>&nbsp;&nbsp;&nbsp;&nbsp;`MaxIssuesToPostForEachIssueProvider`                          | `100`         | Number of issues which should be posted at maximum for each issue provider. Issues are filtered by priority and issues with a file path are prioritized. `null` won't limit issues per issue provider.                                   |
 | `IssuesParameters.PullRequestSystem.`<br/>&nbsp;&nbsp;&nbsp;&nbsp;`ProviderIssueLimits`                                          | `IssuesContext.Parameters.PullRequestSystem.`<br/>&nbsp;&nbsp;&nbsp;&nbsp;`ProviderIssueLimits`                                          | Empty         | Issue limits for individual issue provider. The key must be the `IIssue.ProviderType` of a specific provider to which the limits should be applied to.                                                                                   |
+| `IssuesParameters.PullRequestSystem.`<br/>&nbsp;&nbsp;&nbsp;&nbsp;`IssueFilters`                                                 | `IssuesContext.Parameters.PullRequestSystem.`<br/>&nbsp;&nbsp;&nbsp;&nbsp;`IssueFilters`                                                 | Empty         | List of filter functions which should be applied before posting issues to pull requests.                                                                                                                                                 |
 | `IssuesParameters.PullRequestSystem.`<br/>&nbsp;&nbsp;&nbsp;&nbsp;`ShouldSetPullRequestStatus`                                   | `IssuesContext.Parameters.PullRequestSystem.`<br/>&nbsp;&nbsp;&nbsp;&nbsp;`ShouldSetPullRequestStatus`                                   | `true`        | Indicates whether a status on the pull request should be set if there are any issues found.                                                                                                                                              |
 | `IssuesParameters.PullRequestSystem.`<br/>&nbsp;&nbsp;&nbsp;&nbsp;`ShouldSetSeparatePullRequestStatusForEachIssueProviderAndRun` | `IssuesContext.Parameters.PullRequestSystem.`<br/>&nbsp;&nbsp;&nbsp;&nbsp;`ShouldSetSeparatePullRequestStatusForEachIssueProviderAndRun` | `true`        | Indicates whether a separate status should be set for issues of every issue provider and run.                                                                                                                                            |