Provide all file/image/geometry types in ctkCmdLineModuleTour with correct/incorrect file extensions
Remove incorrect examples, except ctkCmdLineModuleTour which is deliberate
Add image type, fix formatting
Give labels more useful explanation
Add asterisk when generating nameFilters
Cope with leading asterisk, and missing dot
Add fileExtensionsType to xsd for CLI
Make GUI label more verbose
Define fileExtensions as attribute with restriction
Asterisk no longer allowed in file extension
Tidy up widget tour, image type not necessary here, asterisks not valid as examples.
Merge branch '487-standardise-fileExtension'

* 487-standardise-fileExtension:
  Tidy up widget tour, image type not necessary here, asterisks not valid as examples.
  Asterisk no longer allowed in file extension
  Define fileExtensions as attribute with restriction
  Make GUI label more verbose
  Add fileExtensionsType to xsd for CLI
  Cope with leading asterisk, and missing dot
  Add asterisk when generating nameFilters
  Give labels more useful explanation
  Add image type, fix formatting
  Remove incorrect examples, except ctkCmdLineModuleTour which is deliberate
  Provide all file/image/geometry types in ctkCmdLineModuleTour with correct/incorrect file extensions