initMemberX

Generic version of initMember.

Usage:

mixin(initMemberX("foo1.%s = foo2.%s", "someVar"));
mixin(initMemberX("this._%s = foo.%s", "a", "b", "c"));

Turns Into:

foo1.someVar = foo2.someVar;
this._a = foo.a;
this._b = foo.b;
this._c = foo.c;