Shortcut check for markup in a string, before attempting to parse and split the strin...

Shortcut check for markup in a string, before attempting to parse and split the string into individual text styles.

[Issue#] N/A

[Problem]

[Cause]

[Solution] Avoids stylestack if no markup
Markup processing on text view and text input must now be specifically
enabled via the SetMarkupProcessingEnabled( true )

Change-Id: Ide2f77c644c3bec42f71d3f3963f1f9c2584a353
Signed-off-by: Richard Underhill <r.underhill@partner.samsung.com>