Prepare toolchains only once
Copy sources only if we not copy it earlier
Fix preparing MinGW toolchains function
Fix console messages
Copy sources only if we not copy it earlier. Fix messages
Update sqlite to 3.7.15.2
Fix messages
Revert some message changes
Relocate DirectX SDK path variable
Fix PATH
Fix PATH when building Qt
Add parameter to build Qt with angle or OpenGL. Add workaround for QTBUG-28845
Add "--help" switch for build script
Do not using static declaration for mingw toolchain filename
Try to build Qt from source directory because I have problems with building Qt outside sources.
Copy ICU dlls from lib to bin
Fix helper_functions to exit and show log on error
Rework function prepare_toolchains
Fix PATH for building Qt
Fix Qt-Creator build