[Qt-creator] Show sidebar to the right in edit mode (patch)

[Ivan Tsybankov]

Hello,
I've recently tried to use qt creator in dual-monitor (5:4) configuration and 
found that default placement of sidebar is inconvenient since it either partly 
moves the code to another screen or just leaves too little space for the code 
on the first screen so i added an ability to show that sidebar to the right.
Also i added a configuration parameter to control sidebar placement in general 
settings (Enviromnent/General). It is set to usual placement (left) by 
default.

Patch is against today's git clone.
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