kopete: Added ability to build with shared tqca library. #23

Added support for building with the tqca shared library with the ability to use the previous two built-in copies of tqca to ensure a smooth transition to the shared library.

Therefore, the built-in files have been renamed from qca* to tqca*.

This relates to TDE/tqca#2.

Few notes:

many changes are required, so I think it would be clean to have a different approach. For example in R14.0.x we should keep the existing built-in library, since otherwise it would be quite a change to package structures. While in R14.1.0-DEV we could go directly with the shared library approach, removing the built-in version. Since it is teh development branch, I don't see a particular need for a transition period, it is not a stable branch.
In that case, we would need some changes also in tde packaging to add dependency on tqca trinity shared library

Yesterday I have already added the tqca packaging files to both the master and r14.0.x branch. So now the shared libtqca library is already in both PTB and PSB. It would be a little awkward to reverse it now in r14.0.x branch 😿

For the sake of completeness: Although changed seems to be many, in fact there are very few changes – just in connection with renaming qca to tqca. Therefore, it is not a fundamental change. Most only small one-line changes.

Removing built-in copies of tqca is intended for the master branch. There will be a short transition period when it will be possible to build in both ways – giving package managers time to modify their scripts and dependencies.