DMD 0.168 release

[nazo]

Walter Bright wrote:
> Better array literals.
array literal is still very buggy

*Case1: array literal with template
template test(char[] val){
   const char[] test2=val;
}

mixin test!(['a','b','c']);

Case2: array literal with cast and const
const ubyte[] t=cast(ubyte[])['a','b','c'];

Case3: append non-array value
void main(){
   writefln([1,2,3]~2);
}