Restructure project

src/error.cpp

@@ -1,24 +0,0 @@
-#include "error.h"
-
-#include <assert.h>
-
-namespace cmkr {
-namespace error {
-
-Status::Status(Code ec) noexcept : ec_(ec) {}
-
-Status::operator int() const noexcept { return static_cast<int>(ec_); }
-
-Status::Code Status::code() const noexcept { return ec_; }
-
-} // namespace error
-} // namespace cmkr
-
-const char *err_string[] = {
-    "Success", "Runtime error", "Initialization error", "CMake generation error", "Build error",
-};
-
-const char *cmkr_error_status(int i) {
-    assert(i >= 0 && i < 5);
-    return err_string[i];
-}