Custom Reporters and Configurations

• Add possibility to implement a custom reporter
• Add configuration file racoco.ini
• Add -l option as a shout-cut for --exec='prove6 -l'
• Remove all logic related --fix-compunit option. Now the correct folder is determined using the --raku-bin-dir option
• Now --append option works through previous report.txt file instead of previous coverage.log file. The coverage.log file is deleted after each run because it can be very large
• Improve calculation of coverage level. Most likely now the level will be lower than before