Fix #1175: Tighten the definition of Closure nodes.

Capture parameters are separated from normal parameters,
since they play very different roles, and have different
requirements.

Captures can have any type, but must always be immutable.

Parameters must always be of type AnyType, but can be mutable.

Additionally, thisType and resultType disappear, and are now
always implicitly AnyType.
Set `this` to `undefined` when inlining a JSFunctionApply.

This is the semantics of strict mode.
Fix #364 for good: remove magical Rhino top-level package objects.

Instead of hard-coding a list of known problematic top-level
package names, we detect what needs to be removed by listing
the properties in the Packages object.
Merge pull request #1200 from sjrd/tighten-closure-nodes

Fix #1175: Tighten the definition of Closure nodes.
Merge pull request #1202 from sjrd/fix-tlds-in-rhino

Fix #364 for good: remove magical Rhino top-level package objects.
Add replace and deleteCharAt methods to StringBuilder and StringBuffer
Merge pull request #1205 from l15k4/replace-deleteCharAt-StringBuilder

Add replace and deleteCharAt methods to StringBuilder and StringBuffer