[textlayout] move setting of defaultColor into ParseText
[textlayout] move addition of '\n' for the last line into LineBreakText
[textlayout] remove ParseText wrapper that's only used once
[textlayout] add UpdateStyled() for updating with pre-styled text
[textlayout] adds SetStyledText to CGUILabel
[textlayout] perform text styling directly in CGUILabelControl to simplify code
Merge pull request #2728 from jmarshallnz/cleanup_styled_labelling

Cleanup styled labelling code