Add Glimmer DSL for LibUI as a Ruby binding

[AndyObtiva]

Glimmer DSL for LibUI finally became feature-complete and moved from Alpha to Beta

It is a DSL (domain-specific language) that sits on top of the Ruby LibUI binding, but offers a much more natural Ruby way of developing desktop applications with libui by shielding consumers from FFI and C low-level details (e.g. uses real Ruby booleans instead of 1 and 0). It also offers smart defaults, conventions and a hierarchical object-oriented DSL akin of HTML (with desktop controls instead), but much lighter and more programmable with pure Ruby code (unlike HTML, which usualy requires <% %> scriptlets to allow programming).

I look forward to future development of libui. With enough consistent and persistent effort, I am sure this library can eventually rival SWT.

Thank you!

[AndyObtiva]

Just noting that I received a good amount of fanfare when I posted Glimmer DSL for LibUI on Hackernews:
https://news.ycombinator.com/item?id=28965735

With this much excitement, I think this library gotta get re-invigorated and back into frequent releases. Many people would love to have a good cross-platform native library like libui. It is just missing a few features to become feature-complete (e.g. displaying an image on an area).

I'd really look forward to seeing this library move forward from Alpha to Beta.

Cheers.