Combine exit into core; Remove toolkit (#21)

* Combine exit into core

* Remove toolkit

* Format

* Format

* Try to fix diff

* Try to fix diff

* Format

* Add gitattributes

* Use unix endings

* gitattributes is not a txt file

* Renormalize line endings

packages/core/src/core.ts

@@ -1,4 +1,3 @@
-import {ExitCode} from '@actions/exit'
 import {issue, issueCommand} from './command'
 
 import * as path from 'path'
@@ -11,6 +10,26 @@ export interface InputOptions {
   required?: boolean
 }
 
+/**
+ * The code to exit an action
+ */
+export enum ExitCode {
+  /**
+   * A code indicating that the action was successful
+   */
+  Success = 0,
+
+  /**
+   * A code indicating that the action was a failure
+   */
+  Failure = 1,
+
+  /**
+   * A code indicating that the action is complete, but neither succeeded nor failed
+   */
+  Neutral = 78
+}
+
 //-----------------------------------------------------------------------
 // Variables
 //-----------------------------------------------------------------------