Add util.inspect emulation in REPL (#387)

- output values with controlable depth and detail
- add `.hidden` and `.depth` directives
- remove `eval_mode`
- add `use_strict` and `.strict` meta command
- add missing closures on global objects
- save and load command history to/from `~/.qjs_history`
- use USEPROFILE variable on Windows in addition to HOME
- use the same style names as util.inspect

Author: chqrlie