subtle: Lua vs Ruby
During the development I feel more and more disappointed with the limited base functions that ship with Lua. And it's complex to force users to stay in an own namespace and I would also like a more OOPish-way in a scripting language.
I am using Ruby for a long time now and I always liked the power that it has. I finally made the decision to replace Lua with Ruby.
To keep the requirements low I will also replace the SCons build system with Rake - a Makefile replacement written entirely in Ruby. SCons is a really nice system, but using Python to check the environment for Ruby is a bit awkward.