Fix long wait when proxy is set in desktop app
second step, the skin should now be OK
Editor : Optimizations :

- onpropertychanged
- adding an image cache
Small bug
Upgrading Packages
switchkeyboard is now "thread-safe"
keys are now updated correctly when the current mode changes
updating packages + multithread fixes when scrolling triggers changes in the view
New version of the SendInputDriver
Merge remote-tracking branch 'origin/develop' into f-skinmultithreading
merging with develop (retrieving the sendinput)