GTK: Changes to include both dw_(int_)init() functions with deprecated. This allows binary-wise for both old style resource apps and GResource ones to function with the same library. Which one is used depends on whether DW_INCLUDE_DEPRECATED is defined at compile time. Some more thought needs to be given to whether DW_INCLUDE_DEPRECATED should be included in the dwindows-config --cflags because apps expecting GResources will fail to compile with DW_INCLUDE_DEPRECATED defined, due to the dw_init() macro.

# Set these here to change the version for all platforms
DW_MAJOR_VERSION=3
DW_MINOR_VERSION=1