[Development] qcollectiongenerator merged into qhelpgenerator

[Thiago Macieira]

Looks like a lot of projects are now failing to compile with Qt 5.12 because 
qcollectiongenerator has disappeared. The changelog simply says:

 - Removed qhelpconverter tool.
 - Merged qcollectiongenerator tool into the qhelpgenerator tool.

Should I simply replace "collection" with "help" in whatever builds tried to 
use the old tool? Same syntax, no further changes?

Can I also apply the change to projects that must still compile with Qt 5.9 or 
older? 

If the answer is "no" to any of the questions, please bring 
qcollectiongenerator back in 5.12.1 and keep it there until 5.14 or 6.0, even 
if all it does is "exec" the qhelpgenerator tool with the correct syntax. 
We'll advise Linux distributions to backport the patch.

-- 
Thiago Macieira - thiago.macieira (AT) intel.com
  Software Architect - Intel Open Source Technology Center