Replace settings module with skirmish mode

Removed the settings UI and its keybinding logic, added a skirmish view
and corresponding keybindings, simplified the SettingsState to hold
skirmish configuration, updated module exports, and changed the CLI
default map height from 25 to 21. Also fixed the main menu selection
limit.

src/app/state.rs

@@ -1,8 +1,5 @@
 use crate::{
-    app::states::{
-        MainMenuState, PerkDecksState, SettingsOption, SettingsState, SettingsValue,
-        SkillsConfigState, SkirmishState,
-    },
+    app::states::{MainMenuState, PerkDecksState, SettingsState, SkillsConfigState, SkirmishState},
     cli::Cli,
 };
 
@@ -38,54 +35,16 @@ impl GameStates {
                 selected_skill: 0,
             },
             settings: SettingsState {
-                id: 4,
-                name: "Settings",
-                selected_setting: 0,
-                show_popup: false,
-                selected_setting_new_value: String::new(),
-                error_message: String::new(),
-                options: vec![
-                    SettingsOption {
-                        name: "Username",
-                        value: SettingsValue::Text(args.username),
-                    },
-                    SettingsOption {
-                        name: "Game Mode",
-                        value: SettingsValue::GameMode(args.game_mode),
-                    },
-                    SettingsOption {
-                        name: "Map Width",
-                        value: SettingsValue::U8(args.map_width),
-                    },
-                    SettingsOption {
-                        name: "Map Height",
-                        value: SettingsValue::U8(args.map_height),
-                    },
-                    SettingsOption {
-                        name: "Perk Deck",
-                        value: SettingsValue::PerkDeck(args.perk_deck),
-                    },
-                    SettingsOption {
-                        name: "Starting Wood",
-                        value: SettingsValue::U8(args.starting_wood),
-                    },
-                    SettingsOption {
-                        name: "Starting Iron",
-                        value: SettingsValue::U8(args.starting_iron),
-                    },
-                    SettingsOption {
-                        name: "Supply Limit",
-                        value: SettingsValue::U8(args.supply_limit),
-                    },
-                    SettingsOption {
-                        name: "XP Modifier",
-                        value: SettingsValue::F32(args.xp_modifier),
-                    },
-                    SettingsOption {
-                        name: "Skill Points Limit",
-                        value: SettingsValue::U16(args.skill_points_limit),
-                    },
-                ],
+                username: args.username,
+                game_mode: args.game_mode,
+                map_width: args.map_width,
+                map_height: args.map_height,
+                perk_deck: args.perk_deck,
+                starting_wood: args.starting_wood,
+                starting_iron: args.starting_iron,
+                supply_limit: args.supply_limit,
+                xp_modifier: args.xp_modifier,
+                skill_points_limit: args.skill_points_limit,
             },
         }
     }