[JENKINS-23247] Display trends graph last 10/20 sucessful/fail builds in...

... CPPcheck plugin.

- Number of builds in the trend graph can be limited in configuration, default behavior is unlimited.
- Label for "Chart height" fixed, it pointed to "Chart width" box.
- Label for "Display warnings" fixed, there was typo in target name.
- Targets for "Ignore blank files" and "Do not fail build" defined.