Zybats

**Bugfixes**

- each teststeps in one testcase share the same session
- fix duplicate API definition output

**Improvements**

- display result from hook functions in DEBUG level log
- change log level of "Variables & Output" to INFO
- print Invalid testcase path or testcases
- print testcase output in INFO level log

**Bugfixes**

- override current teststep variables with former testcase output variables
- make compatible with testcase name is empty
- skip undefined variable when parsing string content
- add back request method in report

- Massive Refactor and Simplification
- Redesign testcase structure
- Module pipline
- Start Semantic Versioning
- Switch to Apache 2.0 license
- Change logo