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BugFix [#18597] Blender's text editor cant paste from SciTE in linux

Commit patch [#18597] Blender's text editor cant paste from SciTE in linux
Submitted by Campbell.

I made some changes to cleanup a little the code, atoms are now in the
System class. The getClipboard_xcout try to convert/request:
1) Request for UTF8, if fail
2) Request for COMPOUND_TEXT, if fail
3) Request for TEXT, if fail
4) Request for STRING

Test here with SciTE Version 1.77, firefox, xterm and text editor working
with both library's gtk/qt and all work fine.