Initialize attributes in MiniBrowser BrowserControl constructor

So that we avoid problems like Conditional jump or move depends on
uninitialised value(s):
BrowserControl::updateClickCount(XButtonEvent const&) (BrowserControl.cpp:239)

Reviewed by Luciano Wolf
Initialize NIXTouchEvent struct with memset in TouchMocker::sendCurrentTouchEvent

To avoid problems like Conditional jump or move depends on uninitialised
value(s) in convertToWebEventModifiers(unsigned int) (WebEventFactoryNix.cpp:104)

Reviewed by Luciano Wolf