Package Mir 1.8.3 and rename packages to be mostly co-installable with Mir 2
All library packages are co-installable, as well as development packages. Platform packages and docs are also co-installable; it's not strictly needed but to get some consistency.
Programs under /usr/bin
are not renamed, so packages containing them will not be co-installable; it's not really needed. The only exception is mir1_wayland_generator
which is needed by libmir1wayland-dev
.
Fixes: #5 (closed)