Use curl instead of wget

Git on Windows ships with curl, but not wget.
Quoted sourcing of ucpp_settings in setup in case of spaces
Use workbench-2.5 if workbench-3.0 doesn't exist

Thanks to anidev for finding this problem
UCPP_PYTHON_BIN not set on windows-git
Fix python detection on Windows
New platform: windows-git-gccdist

Supports Windows machines that do not have WindRiver installed.
Clean up python detection on windows