Emscripten 1.37.16 to 1.37.36 (#37291)

* trying to build emscriptenPackages not all fail

* reading the console.log it turns out python executable is not in place and that is why emconfigure didnt work

* backup commit

* much more targets are compiling now

* added common revisioning

* revision bump to 1.37.36 (not tested)

* fixed xmllint

* forcing unit testing, will implement the tests after i get home

* json_c test working

* added tests

* tiny fixes

* added documentation