* cmake: use GNUInstallDirs to find install dirs on Linux
* install plugins to lib/imhex/plugins
* fix included files in imhex.spec
* fix the release CI + do not upload x86_64 folder for Fedora
* change rpm names
* added IMHEX_STRIP_RELEASE option to optionally strip releases files (was done all the time before)
* Customize our imhex.spec file (use online building for our Fedora package)
* added IMHEX_PLUGINS_IN_SHARE option for AppImage
* test
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