CSSTidy Code

Added font property resolving (works by default on optimize_shorthands=1).
Tuned unit tests with settings.
Added unit test about multiple font-family.

Added unit tests for shorthands (padding / margin / font-weight / background) and properties (CSS1 / CSS2.0 / CSS2.1).
Need to add shorthand for
'font'
Value: [ [ <'font-style'> || <'font-variant'> || <'font-weight'> ]? <'font-size'> [ / <'line-height'> ]? <'font-family'> ] | caption | icon | menu | message-box | small-caption | status-bar | inherit

Extra documentation for CSSTidy testing suite.

One more test and bugfix

Added color test

Unit test cleanup and more unit tests + bug fix for number optimisation

- Add discard_invalid_selectors cfg and functionality; this fixes some of the duplicate combinator problems
- Minor comment formatting changes
- SETTINGS and FULLEXPECT support added to csst tests

Minor formatting changes:
- Compress extended if/else statement to indicate chaining
- Remove trailing ?>, it's not necessary in PHP!
- Add a custom harness for all unit tests

Finish the rest of the "normal" selectors.

Finish the "correct" selector cases; use inherit which is safer