Add linker flags to the resource lib target to prevent 'unused' stati…

[aleh-arol]

…c initialization removal.

This change is to to allow usage of static initializer from the generated resource lib. The key point is to use new CMake command and features that support cross platform passing of linker flags. So there are flags for GCC/Clang/MSVC that prevents stripping unused objects from generated lib. This functionality unfortunately only available in 3.12, so it's under AUTOLOAD conditional to allow using the old way without any hassle.

Minor changes - added "no AUTOMOC" property to keep CMake from complains when using Qt. Renamed "this_script" - just in case - to the more explicit name.

For now I tested only on GCC, I will test on MSVC/Clang in the upcoming days.

[vector-of-bool]

Nice! I'll take a look when I find the time. Busy with CMake Tools for a few days.

[vector-of-bool]

Ouch. It's been a while.

I'm in the midst of a refactor that will make the issue NLA. Instead of a global initializer, filesystem objects won't be accessed by a single global instance (rather using embedded_filesystem objects). Calling out to a function to get these objects will ensure that the necessary objects files are included in the final link.