- Change distinct -> typedef.

- Order of attribute declaration is changed for `alias`.
- Added `LANGUAGE_DEV_VERSION` env constant.
- Rename `anyfault` -> `fault`.
- Changed `fault` -> `faultdef`.
- Added `attrdef` instead of `alias` for attribute aliases.

test/test_suite/compile_time/compile_time_access_subscript.c3t

@@ -22,7 +22,7 @@ macro check_type($Type)
 
 enum Blurb { FOO }
 
-distinct Bdd = Abc;
+typedef Bdd = Abc;
 fn void main()
 {
 	var $i = (int[4]) { 1, 2, 3, 4 };
@@ -30,7 +30,7 @@ fn void main()
 	var $c = (any[4]) {};
 	check_type(int);
 	check_type(Abc);
-	check_type(anyfault);
+	check_type(fault);
 	check_type(Blurb);
 	check_type(int*);
 	check_type(bool);

test/test_suite/compile_time/comptime_array_folding.c3t

@@ -2,9 +2,7 @@
 module test;
 import std;
 
-alias @TaggedAttr(value) = {
-    @tag("foo", (ValueHere[*]){ value })
-};
+attrdef @TaggedAttr(value) = @tag("foo", (ValueHere[*]){ value });
 
 const FOO_STR = "foo";