[Linux] Add option to make installation follow file system conventions; not all in one place.

[dreirund]

Ahoj,

I want to make a package of this for Arch Linux (to use it as a (build time) dependency for other projects, that not each project has to follow the "dirty" habit of pulling in the source on it's own).

I see that -DCMAKE_INSTALL_PREFIX=/usr installs the executables directly unter /usr, and the assets under /usr/assets and so on. Not suitable for packaging.

Can you make an option to install in a way following Linux filesystem conventions?:

• Executables into [prefix]/bin/
• Assets into [prefix]/share/hello_imgui/
• Libraries into [prefix]/lib/ or [prefix]/lib/hello_imgui/
• Include files into [prefix]/include/ or [prefix]/include/hello_imgui/
• CMake files into [prefix]/share/cmake/hello_imgui/
• Documentation into [prefix]/share/doc/hello_imgui/
• Example executables maybe also into [prefix]/share/doc/hello_imgui/examples/ or so
• Man pages into [prefix]/share/man/man[#]/

etc.

Like HDRView did introduce in this commit, following a note in this issue.

Regards!

[pthom]

Hello,

I'll study this a bit later. This requires careful consideration, so it might take a while.