Add macro to set project version at TDE-wide scope. #84

This macro simplifies setting the project version of the modules and updating it when a new TDE version is available.
The macro can be used in two modes:

tde_set_project_version( )
tde_set_project_version( VERSION "your version number" )

Mode 1. will default to the version number DEFAULT_VERSION set in TDEVersion.cmake in the common cmake module. This is the expected usage mode and will make updating all cmake project versions as simple as a single commit in cmake where the DEFAULT_VERSION number is edited.

Mode 2. can be used to specify a specific version number if necessary in case of special testing purposes.
EDIT: no longer provided

I have prepared the required changes to the module CMakeLists.txt repos and tested a few. I will push them after this PR has been accepted.

For R14.0.x the commit needs some editing during cherry picking.

Note: the macro could have been added to TDEMacros.cmake, but I have chosen a standalone file to simplify finding the place where to update the default version when needed.

I still think about how to use another source to identify the version number so that it is not hardcoded outside the source tree of a particular package.

For the time being, I have three options, but all have their disadvantages:

Search the version in kdemacros.h. The disadvantage is that kdemacros.h is part of tdelibs, so is not available during build of dependencies.
Use the version from ${CMAKE_SOURCE_DIR}/.tdepkginfo, in similar way as macro tde_read_src_metadata. The disadvantage is that this file is generated in deb packaging, but may be missing in other buildings.
I think of adjusting the script create_tarball to add the version number to ${CMAKE_SOURCE_DIR}/.tdescminfo during creating a source tarball. The disadvantage is that it does not solve the version number for distributions, which builds directly on the git clone of the source code.

For now, I have no more ideas.

Hi @SlavekB, thanks for the feedback.
Indeed, all the other three suggested options have downsides which are significant and make those options not practical IMO.

Script create_tarball has been updated, so next to the hard-coded version we can add the way of detecting the version number from ${CMAKE_SOURCE_DIR}/.tdescminfo as designed in point 3) above.

Updated as discussed. The option for custom version is no longer available.

Great, the result looks good.

Add macro to set project version at TDE-wide scope. #84

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