[1.1] Internal variables for version return 0 (w/ patch)

Just as I said I no longer had pending patches, this is a new one!

The three global variables _majorVersion, _minorVersion, _updateVersion all return 0. The variables are available to plugins and are probably used elsewhere too.

This is because the function int version() in file mscore/mscore/utils.cpp expects a version string with 3 elements ("x.y.z"), while the current string only has 2 ("1.1").

The attached patch corrects this function to accept a variable number of elements (3, 2, 1, or none). Tested with plugins.

M.