Debugger now steps through embedded PHP in HTML files.

Debugger now steps through embedded PHP in HTML files.
Fixed a bug that prevented the debugger from popping up the right line in a PHP editor.

Mods:

debug.ui plugin:
    PHPSourceLocator.java: Moved this file to the launching plugin

launching:
    PHPSourceLocator.java:
        Moved this file from the debug.ui plugin
    PHPLaunchConfigurationDelegate.java:
        Added the getLaunch method.
        This puts the PHP source locator into the launch,
        which let's the debugger client find lines in PHP source.
    plugin.xml:
        PHP debugger now associated with .htm and .html files,
        so it's possible to step through embedded PHP code in HTML files.

Tested: PHPeclipse CVS HEAD on Windows, against Xampp on local host.