riched20: EM_SETTEXTEX supports RTF strings, with tests

[Alex Villací­s Lasso]

Besides WM_SETTEXT, EM_SETTEXTEX also supports RTF strings. With tests 
to prove it.

Changelog:
* Add support for EM_SETTEXTEX with RTF strings.
* Add missing test for WM_SETTEXT with RTF strings.
* Add test for EM_SETTEXTEX with RTF strings.

-- 
perl -e '$x=2.4;print sprintf("%.0f + %.0f = %.0f\n",$x,$x,$x+$x);'

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