Redesigned ext_skel to be written entirely in PHP with no dependencie…

…s, this means it will now run on Windows without Cygwin and other nonsense.

It no longer includes a way to generate XML documentation (the PHP documentation utilities already got tools for that in svn under phpdoc/doc-base) and it no longer support function stubs.

$ php ext_skel.php --help
php ext_skel.php --ext=<name> [--experimental] [--author=<name>]
                 [--dir=<path>] [--std] [--onlyunix]
                 [--onlywindows] [--help]

  --ext=<name>          The name of the extension defined as <name>
  --experimental        Passed if this extension is experimental, this creates
                        the EXPERIMENTAL file in the root of the extension
  --author=<name>       Your name, this is used if --header is passed and
                        for the CREDITS file
  --dir=<path>          Path to the directory for where extension should be
                        created. Defaults to the directory of where this script
                        lives
  --std                 If passed, the standard header and vim rules footer used

                        in extensions that is included in the core, will be used

  --onlyunix            Only generate configure scripts for Unix
  --onlywindows         Only generate configure scripts for Windows
  --help                This help

Example usage:
$ php ext_skel.php --ext test --std --experimental
$ php ext_skel.php --ext kalle --author "Kalle Sommer Nielsen"
$ php ext_skel.php --ext phpfi --dir "/home/kalle/dev/" --onlyunix

NEWS

@@ -2,14 +2,20 @@ PHP                                                                        NEWS
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
?? ??? ????, PHP 7.3.0alpha1

- Session:
  . Fixed bug #74941 (session fails to start after having headers sent). 
    (morozov)
- Core:
  . Redesigned the old ext_skel program written in PHP, run: 
    'php ext_skel.php' for all options. This means there is no dependencies 
    thrus making it work on Windows out of the box. (Kalle)

- LDAP:
  . Added ldap_exop_refresh helper for EXOP REFRESH operation with dds overlay
  . Added ldap_exop_refresh helper for EXOP REFRESH operation with dds overlay. 
    (C�me)

- ODBC:
  . Removed support for Birdstep. (Kalle)

- Session:
  . Fixed bug #74941 (session fails to start after having headers sent). 
    (morozov)

<<< NOTE: Insert NEWS from last stable release here prior to actual release! >>>

UPGRADING

@@ -19,6 +19,11 @@ PHP 7.3 UPGRADE NOTES
1. Backward Incompatible Changes
========================================

Core:
  . The ext_skel utility has been completely redesigned with new options and 
    some old options removed. This is now written in PHP and have no external 
	dependencies.

========================================
2. New Features
========================================