Musegician v0.8.10 - Progress Bars

Now progress bars are shown while doing a number of time-intensive tasks, like importing a music library and building the database, or various other large tasks.

A number of exceptions have been caught and more clearly documented.

TagLibSharp has been added as a submodule, so I can leverage bugfixes and improvements, since the nuget package was from 2012.

I've changed the directory selection window to instead use a standard winforms directory selector, allowing me to remove several outdated/unsupported windows shell extension libraries, so now I can properly sign the executable.

The bootstrapper installer still doesn't work quite right when it comes to making sure the EntityFramework is installed, so grab the installer from Musegician\MusegicianBootstrapperInstaller\Redist and install it first, or download and install SQL Server 2017 Express here - just make sure you check the box to install SqlLocalDB, as that's what this uses.