Syntax error in Rocq output due to illegal character in skolem symbols / types

[jrosain]

Description of the issue

The Rocq output is currently broken in two ways:

• on output of the context, TPTP's arrow is used instead of Rocq arrow, e.g., Parameter p : goeland_U > Prop instead of Parameter p : goeland_U -> Prop
• skolem symbols are now written skolem@foo, and the @ is not a valid lexeme for Rocq.

Flags used

-context -orocq

Small problem file to reproduce the bug

% This tests both problems at once
fof(rocq_output_test,conjecture,! [X]: (p(X) | ~p(X))).

Version of Goéland where the issue occurs

This is in the master version (v.1.2-dev.rc9841dae9e19c823410fa0e003a325f8ac1cd44b)