Merge script principal implementations into one class.
Should reduce footprint, speed up calls to caps a little bit, and fixes several memory leaks.
Also fixes bugs 211174 and 211263
r=jst@netscape.comsr=bzbarsky@mit.edumoa=mstoltz@netscape.com (he looked at an earlier patch and said it looked fine, and will do a retroactive review when he returns from vacation as well)
17977 [DOGFOOD] Reading documents using document.body
17538 document.lastModified is exposed
17537 document.images vulnerabilities
16036 [DOGFOOD] document.Element exposes the DOM of documents from
15757 [DOGFOOD] Injecting JS code using setAttribute and getElemen
15550 Injecting text in documents from any domain using createText
15067 [DOGFOOD] getElementsByTagName() allows reading of arbitrary
* Create an array of dom property policy types and initialize it when the script security manager is created.
* Move some implementation code to a new shared implementation base class.
* Implement privilege enabling, disabling and reverting
* Implement stack walking for checking privileges.
r=mstoltz@netscape.com
* Modify nsIPref to support security policy work.
r=neeti@netscape.com
