[Cin] Aesthetic: Icons for SUV theme

[Igor BEGHETTO]

I can see some aesthetic problems for the SUV theme.
- If you want, I modified the icons about the patchbay 
(Cin_20200923_a2.png): expandpatch and tumblepatch.
- The background of the New Project window (at the bottom) don't mix the 
OK and Cancel buttons (Cin_20200923_c2_NewProject.png).
- Preferences window, Appearance tab 
(Cin_20200923_d2_PreferencesAppearance.png): the texts "Warnings" and 
"Flags" are in a wrong place. They should be under the line.

If you want you can find the PNGs in the compressed file.
Thanks!

IgorBeg
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