Add installer

* start

* Add tests

* Clean up changes

* Update tool-cache we consume

* Use custom 7zr

node_modules/@actions/exec/lib/toolrunner.d.ts

@@ -0,0 +1,37 @@
+/// <reference types="node" />
+import * as events from 'events';
+import * as im from './interfaces';
+export declare class ToolRunner extends events.EventEmitter {
+    constructor(toolPath: string, args?: string[], options?: im.ExecOptions);
+    private toolPath;
+    private args;
+    private options;
+    private _debug;
+    private _getCommandString;
+    private _processLineBuffer;
+    private _getSpawnFileName;
+    private _getSpawnArgs;
+    private _endsWith;
+    private _isCmdFile;
+    private _windowsQuoteCmdArg;
+    private _uvQuoteCmdArg;
+    private _cloneExecOptions;
+    private _getSpawnOptions;
+    /**
+     * Exec a tool.
+     * Output will be streamed to the live console.
+     * Returns promise with return code
+     *
+     * @param     tool     path to tool to exec
+     * @param     options  optional exec options.  See ExecOptions
+     * @returns   number
+     */
+    exec(): Promise<number>;
+}
+/**
+ * Convert an arg string to an array of args. Handles escaping
+ *
+ * @param    argString   string of arguments
+ * @returns  string[]    array of arguments
+ */
+export declare function argStringToArray(argString: string): string[];