Uplift plugin to work with CodeChecker 6.8

[gyorb]

• cleanup code base (no background CodeChecker server should be necessary) Remove CodeChecker server dependency #115
• introduce proper plugin versioning (see Project version 0.0.1-SNAPSHOT update to 0.0.5 #109)
• use CodeChecker 6.8 to analyze the project and generate the plist report files Initial changes to uplift compatibility to 6.8.0 #113
• the generated plist files are parsed and processed by eclipse parse plist files in the plugin #116
• Test the uplifted plugin with various Eclipse versions Test the uplifted plugin with various Eclipse versions #117
• Write/Extend the documentation for the refactored code.

[vodorok]

A solution to versioning problem #109 was added in 5d5c107.

[vodorok]

Extended/updated documentation in f227dcd.

[dkrupp]

tested with Eclipse 2018-09 and Oxygen-1