Update coding standards:
Update coding standards:

- Use "nullptr" in CEGUI 1.x onwards.
- Use "enum class" in CEGUI 1.x onwards.
- Change maximal code line length from 80 characters to 100.

--HG--
branch : nullptr

cbeck88/cegui-mirror-two,cbeck88/cegui-mirror-two,cbeck88/cegui-mirror-two,cbeck88/cegui-mirror-two,cbeck88/cegui-mirror-two