Crate unification (#88)

* move client/server/config into shared

* move platforms into shared

* move head drops into shared

* move tb_entities to shared

* reduce server to just a call into shared

* get solo play working

* fix server opening window

* fix fmt

* extracted a few more modules from client

* near completely migrated client

* fixed duplicate CharacterInputEnabled definition

* simplify a few things related to builds

* more simplifications

* fix warnings/check

* ci update

* address comments

* try fixing macos steam build

* address comments

* address comments

* CI tweaks with default client feature

---------

Co-authored-by: PROMETHIA-27 <electriccobras@gmail.com>

crates/hedz_reloaded/src/client/backpack/mod.rs

@@ -0,0 +1,7 @@
+pub mod backpack_ui;
+
+use bevy::prelude::*;
+
+pub fn plugin(app: &mut App) {
+    app.add_plugins(backpack_ui::plugin);
+}