Fix co-existance of TypeScript and JavaScript declarations

Rename the FC.d.ts to FC.ts to move it from the ambient to normal
context, thus making namespace declarations from the FC.ts to extend but
not overwrite "namespace" declarations from .js files in the TypeScript
AST.

devTools/FC.d.ts → devTools/FC.ts

-declare namespace App {
+/// <reference path="../js/002-config/fc-js-init.js" />
+namespace App {
 	namespace Art {}
 
 	namespace Corporate {}
@@ -262,7 +263,7 @@ declare namespace App {
 			labelTagsClear: boolean;
 		}
 
-		class Rule {
+		declare interface Rule {
 			ID: string;
 			name: string;
 			condition: RuleConditions;
@@ -277,12 +278,12 @@ declare namespace App {
 		namespace DOM {
 			namespace Widgets { }
 
-			function makeElement<K extends keyof HTMLElementTagNameMap>(tag: K, content: string | Node, classNames: string | string[]): HTMLElementTagNameMap[K];
-			function appendNewElement<K extends keyof HTMLElementTagNameMap>(tag: K, parent: ParentNode, content?: string | Node, classNames?: string | string[]): HTMLElementTagNameMap[K];
+			declare function makeElement<K extends keyof HTMLElementTagNameMap>(tag: K, content: string | Node, classNames: string | string[]): HTMLElementTagNameMap[K];
+			declare function appendNewElement<K extends keyof HTMLElementTagNameMap>(tag: K, parent: ParentNode, content?: string | Node, classNames?: string | string[]): HTMLElementTagNameMap[K];
 		}
 		namespace View { }
 		namespace SlaveSummary {
-			type AppendRenderer = (slave: App.Entity.SlaveState, parentNode: Node) => void;
+			type AppendRenderer = (slave: FC.SlaveState, parentNode: Node) => void;
 
 			class AbbreviationState {
 				clothes: number;
@@ -561,7 +562,7 @@ declare namespace FC {
 
 	enum NoObject {
 		Value = 0
-	};
+	}
 
 	type SlaveStateOrZero = SlaveState | NoObject;
 
@@ -570,4 +571,4 @@ declare namespace FC {
 	interface GameVariables extends DefaultGameStateVariables, ResetOnNGPVariables {}
 }
 
-const V: FC.GameVariables;
+declare const V: FC.GameVariables;