(svn r12869) [0.6] -Backport from trunk r12714, r12708, r12674, r12577, r12553:
- Fix: Do not move windows below the toolbar on resizes unless they would go behind the toolbar [FS#1904] (r12714)
- Fix: Increase default sound buffer size only for Vista [FS#1914] (r12708)
- Fix: Colour remaps on station sprites only worked for company colours [FS#1902] (r12674)
- Fix: The convert signal button disallowed signal dragging when the signal GUI was closed (r12577)
- Fix: Redraw the signal GUI when the signal drag density changes in the patch settings and vice versa (r12553)

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