Add installer

* start

* Add tests

* Clean up changes

* Update tool-cache we consume

* Use custom 7zr

node_modules/@actions/io/lib/io.d.ts

@@ -0,0 +1,48 @@
+/**
+ * Interface for cp/mv options
+ */
+export interface CopyOptions {
+    /** Optional. Whether to recursively copy all subdirectories. Defaults to false */
+    recursive?: boolean;
+    /** Optional. Whether to overwrite existing files in the destination. Defaults to true */
+    force?: boolean;
+}
+/**
+ * Copies a file or folder.
+ *
+ * @param     source    source path
+ * @param     dest      destination path
+ * @param     options   optional. See CopyOptions.
+ */
+export declare function cp(source: string, dest: string, options?: CopyOptions): Promise<void>;
+/**
+ * Moves a path.
+ *
+ * @param     source    source path
+ * @param     dest      destination path
+ * @param     options   optional. See CopyOptions.
+ */
+export declare function mv(source: string, dest: string, options?: CopyOptions): Promise<void>;
+/**
+ * Remove a path recursively with force
+ *
+ * @param inputPath path to remove
+ */
+export declare function rmRF(inputPath: string): Promise<void>;
+/**
+ * Make a directory.  Creates the full path with folders in between
+ * Will throw if it fails
+ *
+ * @param   fsPath        path to create
+ * @returns Promise<void>
+ */
+export declare function mkdirP(fsPath: string): Promise<void>;
+/**
+ * Returns path of a tool had the tool actually been invoked.  Resolves via paths.
+ * If you check and the tool does not exist, it will throw.
+ *
+ * @param     tool              name of the tool
+ * @param     check             whether to check if tool exists
+ * @returns   Promise<string>   path to tool
+ */
+export declare function which(tool: string, check?: boolean): Promise<string>;