[Cmake] Compilation of user interface files

[Franck Bettinger]

Hi,

I've added compilation of .ui files to cmake (files created with the designer 
tool included in Qt distributions). It uses the QT_WRAP_UI command to 
generate headers (.h) and source files (.cxx). The headers file should then 
be compiled into moc files using QT_WRAP_CPP. 

For instance if you have a list of files called project_ui_files containing 
.ui source files you have to write :

QT_WRAP_UI(
      project
      project_h_files
      project_cxx_files
      project_ui_files
      )
 
QT_WRAP_CPP(
      project
      project_moc_files
      project_h_files
      )

in that order.

I've tested it using linux and it works fine. 
Can anyone who is using designer test it with Windows ? 

Franck