[precompile] Use a single Precompile.cpp

Author: dherrera-meta

src/App.cpp

@@ -4,4 +4,10 @@
 //
 // SPDX-License-Identifier: BSD-3-Clause
 
+#include <CLI/impl/App_inl.hpp>
+#include <CLI/impl/Config_inl.hpp>
+#include <CLI/impl/Formatter_inl.hpp>
+#include <CLI/impl/Option_inl.hpp>
+#include <CLI/impl/Split_inl.hpp>
 #include <CLI/impl/StringTools_inl.hpp>
+#include <CLI/impl/Validators_inl.hpp>