Issue fixes, better performance, json2qsql

What's Changed

• Star schema by @vadim-tropashko in #20
• Issue #21 by @vadim-tropashko in #22
• Issue #23 by @vadim-tropashko in #24
• Issues #25+ by @vadim-tropashko in #38
• Other issues #26, #27, #28, #29, #30, #31, #32, #33, #35, #39, #40, #42, #43, #46, #48, #49, #51
• Improved performance
• json2sql

Full Changelog: v1.1.4...v1.2.1