File List order

[qarlosalberto]

Currently the order is:

1. A file named .vhdl_ls.toml in the user home folder.
2. A file name from the VHDL_LS_CONFIG environment variable.
3. A file named vhdl_ls.toml in the workspace root.

I think that it make sense to switch 1 by 2. For example the user could have a .vhdl_ls.toml in the home directory, but an extension could create automatically a .vhdl_ls.toml file in a random folder. In this case the home file has priority. And the extension needs to delete the .vhdl_ls.tomel file in home.