Optimized displaying message boxes
Removed unnecessary references from BuildTasks
Small DE warnings and field-visibility cleanup
Simplified registry node name for stored settings
Added configurable path to QNX tools

There is now an option to specify path to QNX toolset via system
registry (QNXToolsPath). They don't need anymore to be stored inside
%ProgramFiles(x86)%\BlackBerry\VSPlugin-SDK\qnxtools.
Improved searching for JavaHome