Remove unique dev assembly

[LumpBloom7]

While it was nice and convenient to run the release and dev builds side by side in osu, it was causing problems elsewhere, such as shortname problems, and debug and incompatibilities with dynamic compilation (multiple assemblies with same object). It was essentially trading one convenience for the loss of others.

This shouldn't affect end-users much, as ideally, they'd only run release builds. _{Big RIP for those who intentionally download dev builds just to fill the ruleset bar}

Build artifacts will instead use the Debug builds.