Modularize, optimize, and add support for SA 1.5

* Modularize applet elements
* Modularize element partials
* Auto-build partials into webpage output.
* Auto-build partials into Gloo output.
* Auto-scale assets into asset bundle.
* Symlink `gloo_assets_202`
* Symlink `EapiPlaceholder.js`
* Add support for SA 1.5 and integrate with converter.