Update cmake for use with CentOS 8 rpms

* Update Findspdlog.cmake script to use spdlog's own cmake scripts
* Add linking to spdlog::spdlog to all deimos targets
* Clean up and update Findphobos.cmake
6 jobs for devel in 13 minutes and 46 seconds (queued for 1 second)
Status Name Job ID Coverage
  Static Analysis
passed Format #5887
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passed Lint #5888
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  Build
passed Documentation #5889
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  Test
passed Authorisation Disabled #5891
docker

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passed Default #5890
docker

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passed centos7 #5892
docker

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