Debug category file installation

[Luca Beltrame]

Hello,

thanks to kdebugsettings and category files, now it is possible to easily 
enable/disable debugging at runtime. However, there are a few shortcomings to 
this approach, which emerged when I tried to package KF5 5.41 for openSUSE:

1. There should be a macro in ECM to unify the installation of those files
2. The .categories files are not configuration data and should be installed 
below SHARE_INSTALL_PREFIX instead
3. In case of library upgrades (say, in KF6 times), those files would conflict 
in their current location (this wouldn't affect applications, however)

For 1, a solution would be to either extend ECMQtDeclareLoggingCategory to 
generate the category files, and install them, or have a separate macro to 
collect and install separately the category files (useful for projects with 
multiple ones like KDevelop, where they are defined for each lib/plugin 
subdirectory). 2.  and 3. Would be solved by having either a subdirectory 
("kf5"? But I understand Plasma and Applications use the same mechanism, so 
probably something else would be needed) to SHARE_INSTALL_PREFIX. 

Opinions?
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