Remove all symbol libraries from the project file after remapping to
prevent symbols that should be loaded from the cache being loaded from
a library further up the search order.  Save the project file to clear
all of the libraries so they never get reloaded again.

Remove the symbol library management dialog and menu entries.

Rename the symbol library table dialog menu entry.

Remove all symbol libraries from default project file to prevent clashes
with the cache library.

Fix illegal symbol naming in Eagle plugin.