added sample program for benchmarking Mustache libraries: native SynMustache vs JavaScript/SpiderMonkey...

And the winner is SynMustache, which is 10 times faster, uses almost no memory during process, and handles inlined {{>partials}} natively (whereas we have to handle them manually with mustache.js) - who says that Garbage Collection and immutable strings in modern JITted runtimes are faster than "native" Delphi applications? still preferring the "NextGen" roadmap?