v3.0.0

I consider this a major update due to HUGE perfomance improvements and overall structure.
Speed comparison is posted here
Each function was reworked for better perfomance. Separate function perfomance comparisons will be posted later

• Most functions are independent from json_trim and automatically trim all spaces outside strings
• Each function now has "sub" argument, which defines if output is returned or not. Each function's output is stored as <function name>_output instead of echoing it for capture. It's made mostly for recursive functions which can now just save the output/use the variable directly, rather than spawning a subshell.
• json_validate now also checks for escaped characters and missing commas.
• Most functions were tested multiple times, but there still can be bugs during parsing.