Added scoping.

ste:mktag generated tags now have an own scope. They even resemble
closures, since they inherit their parent scope.

A lot of work was done to keep this compatible with older programs.
However:

* Templates that relied on the non-scoping behavior of tags will probably
  fail.
* Since $ste->vars is no longer an actual array, things like
    $ste->vars["foo"]["bar"] = "baz"
  are no longer possible! A single field access will still work:
    $ste->vars["foo"] = "bar"

1 files changed, 3 insertions, 0 deletions

diff --git a/ste.php b/ste.php
index 6647098..7e40fae 100644
--- a/ste.php
+++ b/ste.php
@@ -30,6 +30,9 @@ require_once(__DIR__ . "/Calc.php");
 require_once(__DIR__ . "/Parser.php");
 require_once(__DIR__ . "/Transcompiler.php");
 
+require_once(__DIR__ . "/VarNotInScope.php");
+require_once(__DIR__ . "/Scope.php");
+
 require_once(__DIR__ . "/STEStandardLibrary.php");
 require_once(__DIR__ . "/STECore.php");