Move menu to plugins mod

Reqwest and serde deps

Move Cfg things to a new mod

Create plugins mod, move splash to plugins

Move user cfgs to CfgUser

Register UI, input naming changes

Unused muts

Naming changes

Basic menu layout, missing functionality still

temporary branding logo

Egui and egui inspector deps

Add FiraMono font

Upgrade bevy to 0.9.1

Add window configurations

Default bevy setup

Add bevy dep

Create cargo project for sdbclient