Linux install fix

[mikelow]

This is an attempt to improve the Linux installation. Linux convention isn't my forte, so hopefully I didn't mess this up.

The changes:

• install mame_roms.xml into ${CMAKE_INSTALL_PREFIX}/share/vgmtrans (ie. /usr/local/share/vgmtrans).
• install libbass.so and libbassmidi.so into ${CMAKE_INSTALL_PREFIX}/lib (ie. /usr/local/lib)
• move responsibility for defining the resource path to the Qt CMake script. It now passes a RESOURCE_DIR string macro into the project and QtVGMRoot::UI_GetResourceDirPath() simply returns it.

How Has This Been Tested?

Loaded mame_roms.xml successfully on Ubuntu 22.04, Windows 10, and MacOS Sonoma. libbass loaded successfully on Ubuntu.

Types of changes

• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• [x] My code follows the code style of this project.
• [x] I have read the CONTRIBUTING document.

[mikelow]

Ok. I thought that might be the right place for path for the libs, but wasn't sure. By "keep it as-is" do you mean ditch the PR or move forward with it? I'm cool with either.

[TheComputerGuy96]

@mikelow I think the BASS libraries should be in a separate vgmtrans subdirectory inside of /usr/lib (to prevent conflicts with any version of system BASS)

This requires a rpath to be set though 🐸

[sykhro]

By "keep it as-is" do you mean ditch the PR or move forward with it? I'm cool with either.

I did some research and it seems like the place for this stuff is indeed /opt, we should avoid putting our deps into system lib directories imo

[mikelow]

I didn't understand how our linux packaging worked when I started on this, and now I'm no longer convinced that fixing the install command is adding much value. I'll close the PR.