- add `js_snprintf`, `js_printf`... to handle extra conversions:
- support for wxx length modifier
- support for `%b` and `%B`
- `%oa` and `%#oa` to convert `JSAtom` values
- `%ps` to convert `JSString` values
- add `dbuf_vprintf_fun` replaceable `dbuf_printf` handler
- change `JS_DumpString` to `JS_FormatString` to convert `JSSAtom` to quoted strings
- change `JS_AtomGetStrRT` to `JS_FormatAtom` to convert `JSAtom` to strings
- change `JS_AtomGetStr` to return direct string pointer for builtin atoms
- remove `print_atom`
- use custom conversions for trace messages and error messages
- add support for `%b`, `%B` and `w` length modifier in `std.printf`
- remove error handlers: `JS_ThrowTypeErrorAtom` and `JS_ThrowSyntaxErrorAtom`
- add `is_lower_ascii()` and `to_lower_ascii()`
- add floating point conversions and wide string conversions
- unbreak compilation: prevent name collision on pow10
- minimize `vsnprintf` calls in `dbuf_vprintf_default`
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