Migrate font-lock and indentation to cc-mode

Ported from Daniel Hackney's fork https://github.com/haxney/php-mode

It looks like most of the font-lock support can be done through creative use of
`c-lang-defconst`. I am using the following files for moral guidance:

- [`yang-mode`](http://www.emacswiki.org/emacs/yang-mode.el)
- [`protobuf-mode`](http://code.google.com/p/protobuf/source/browse/trunk/editors/protobuf-mode.el)
- [`vala-mode`](https://live.gnome.org/Vala/Emacs?action=AttachFile&do=get&target=vala-mode.el)
- [`derived-mode-ex`](http://cc-mode.sourceforge.net/derived-mode-ex.el)
- [`actionscript-mode-connors`](http://www.emacswiki.org/emacs/actionscript-mode-connors.el)
- [`cuda-mode`](http://www.emacswiki.org/emacs/CudaMode)
- [`cc-php-js-cs`](http://www.mail-archive.com/gnu-emacs-sources@gnu.org/msg01804/cc-php-js-cs.el)
- [`boogie-mode`](http://www.pm.inf.ethz.ch/people/josephr/boogie-mode)