Implement Navier-Stokes regularizations for Euler eq (!79)

* add sod_shock_tube examples

* add examples mono and navier-stokes regularization of euler_isentropic_flow problem

* remove dead code

* update ref test burgers_sine_aventropy

* undo deletion

* remove dead code

* beautify log details when unequal number of output times is encountered

* refactor printing of failed test details

* im in a rush

* fix ref test log info

* remove unused var

* revert callbacks

* add invalid assertion in glgl integration method

* remove bernsteining from AV regularization

* add 0th order smoother

* remove lower threshold on entropy av

* wip -- tinker with applying Bernsteining to the LDG variables

* also forward project to rhs

* remove unnecessary computations from callback

* put lower threshold on entropy AV

* inline bernsteining workhorse

* use inplace ops for entropy TCI

* add ref test fv_euler_isentropic_flow

* fixup hrsc initialization for EulerEq

* fix args for Project constructor

* update deps; put compat bound on PrettyTables.jl

* add ref test euler_isentropic_flow_regulate-ns -- disabled for now

* add dispatch for av regularization in rhs!; wip implementation of new regularizations

* add a namedtuple for parameters to Project struct

* fix call to broadcast in callbacks.jl

* add av_regularization parameter

* dispatch TODO on Symbol