Improve CSS syntax error

[willmcgugan]

CSS syntax errors produce somewhat cryptic errors. We should try and improve this.

In particular we should try to produce a helpful error for missing semi-colons, which will be a common issue.

[tusharsadhwani]

or... make semicolons optional?

[tusharsadhwani]

if you need to implement that manually, you can try doing "automatic semicolon insertion", like javascript.

[willmcgugan]

They were optinal originally. We changed it to be in line with browser CSS.

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