Add attribute to XML syntax specifying a script to generate files.
The script must provide a --dry-run mode in which it prints the files
it intends to create and their attributes to stdout.
Rework the CustomWizardContext structure to contain target path
and parameter mappings, simplify some code there.
Remove all hacks/conventions of considering the last generated
file as project file, etc. and instead add attributes flags to
Core::GeneratedFile, giving fine-grained control of what to do
with the file. Implement static utility functions in wizards
that handle it. Add boolean XML-attributes "openeditor"/"openproject"
to the file elements used by the CustomWizard XML-specification.
Manually set the attributes in all wizards.
Task-number: QTCREATORBUG-1166
Pass around shared context containing basic replacement map.
CustomProjectWizard adds %ProjectName% to it obtained from signal
BaseProjectWizardDialog::introPageLeft(). Move replacement code into
context. Add new modifier 'c' for capitalizing words.
