d.ts header for libmraa

[arfoll]

As discussed in #101 by @barais it would be great to provide a typeface d.ts header to libmraa.

[barais]

Ok I just release here the d.ts generator from hpp header

https://github.com/HEADS-project/mraa_hpp2ts_generator

I you disagree with the mapping of type you just have to change that file.
https://github.com/HEADS-project/mraa_hpp2ts_generator/blob/master/src/main/java/eu/heads/project/ts/HPPSourceParser.java#L61

It is a bit quick and dirty but I will keep improving it.

I also update the examples.
https://github.com/HEADS-project/mraa

[arfoll]

That is quite cool, however I feel it's too complicated to add to our build system. How about I add this to our CI system so every time we make a new build it generates a d.ts file and uploads it somewhere so people can grab it?

The mapping of types still seems a bit off, I'm not too sure how your program works but uint8_t pointers should get mapped to a node_buffer which I'm not sure is supported in general js? But that's what we expect as an input in mraa.node.