Migrate to use GNUInstallDirs

Proper install DIRS paths using the canonical forms
Install cmake finder in a multi-arch compatible place
FindSimbody.cmake aware of multiarch and install to proper place

Fix debian metadata to keep in sync with latest improvements
Rename Simbody cmake finder
USe CMAKE_INSTALL_DOCDIR for documentation
Use CMAKE_INSTALL_DOCDIR as destinatin for docs
Move to install binaries in FULL_BINDIR
Move simbody-visualizer app to proper package
Move simbody-visualizer app to proper package
Fix path with documentation
Install simbody-visualizer inside lib/arch/simbody
Remove CMAKE_INSTALL_PREFIX and FULL cmake path

CMAKE_INSTALL_PREFIX is not needed in relative paths
FULL_CMAKE_* paths are not allowed by policy
Install simbody-visualizer inside lib
Enable the test suite
Close ITP bug
Typo in control file
Add doxygen-latex to build-depends
Update standard version to 3.9.5
Use lowercase directory to install docs
Fix closes: keyword