remove keywords

[Lutger]

mandel wrote:
> A proposal in a nutshell:
> 
> - removal of the keywords "unittest, "version" and similar.
> 
> - replaced by global compile time variables.
> 
> - "dmd -<name>=<value>" to set them. Variables not found result in 
> compiler warnings
> 
> - "dmd -list version*" or similar to list all global variable names with 
> prefix "version"
> 
> -> less keywords, more powerfull control (use in boolean expressions), 
> more native syntax, easier to understand
> 
> Ideas? Problems? Objections?

There are two things I like in the current system that will be lost with 
this proposal:
1. Distinction between conditional compilation as in different versions 
of the software and use of static if for meta- and generic programming

2. A standardized naming scheme. For example, there's nothing magical 
about the debug keyword as far as I know, it could just be replaced with 
version(Debug). But it's nice that everybody uses the same thing for the 
same purpose.