Updated casts (#684)

Cast code rework. Remove llvm_set_bool and friends.

test/test_suite/vector/vector_to_array_fail.c3

@@ -0,0 +1,13 @@
+module test;
+import std::io;
+fn void main()
+{
+	int[<2>] x = { 4, 7 };
+	int[2] y = x;
+	int[*] y1 = y;
+	int[*] y2 = x;
+	int[<*>] z = x;
+	int[<*>] w = y;
+	double[<2>] ww = x;
+	double[<2>] www = y; // #error: 'int[2]' to 'double[<2>]'
+}