clang-1500.0.40.1 linker warnings eliminated

complete overhaul of cctools; now much more modularised and the relation between the different options is exposed more clearly. Alongside, there is an elimination of -rpath duplicates integrated which silences the undesirable clang 15 linker warnings on OSX.

added 7 commits

• def92ff3...ed2b7961 - 4 commits from branch sac-group:develop
• 61e86632 - refined linking for clang
• fad99d8e - completely restructured cctools to allow for proper rpath filtering...
• d2e70896 - commented cctools and did local debugging

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added 1 commit

• c60dbe64 - eradicated a bug within the cctool refactoring, created a new filemgr...

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assigned to @sbs

requested review from @JordyAaldering

resolved all threads

added 1 commit

• 7597c63e - addressed the issues from the code review

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approved this merge request

enabled an automatic merge when the pipeline for 7597c63e succeeds

mentioned in commit 39967709

merged