Add support for lcov files

This PR will add support for `lcov.info` files. The current functionallity of parsing the simplecov.json will be dropped because simplecov can also output lcov files.

With this pull request a lot of new coverage tools are going to be supported.

### Tasks
- [ ] Lcov Parser
- [ ] PanelView
  - [ ] Change columns to *File, Coverage, Relevant lines, Covered, Missed, Hits/Line*
  - [ ] Fix sorting
- [ ] Configuration
  - [ ] Default `coverageFilePath` to: "coverage/lcov.info"
- [ ] Readme
  - [ ] Document supported coverage tools