Add support for Micro QuickJS runtime - https://github.com/bellard/mquickjs

It would be great if an alternative mquickjs runtime is also supported.

> MicroQuickJS (aka. MQuickJS) is a JavaScript engine targeted at embedded systems. It compiles and runs JavaScript programs using as little as 10 kB of RAM. The whole engine requires about 100 kB of ROM (ARM Thumb-2 code) including the C library. The speed is comparable to QuickJS.