Merge core into common

Part of #1507

src/Terminal2.test.ts

@@ -12,7 +12,7 @@ import * as path from 'path';
 import * as pty from 'node-pty';
 import { Terminal } from './Terminal';
 import { IViewport } from './Types';
-import { CellData, WHITESPACE_CELL_CHAR } from 'core/buffer/BufferLine';
+import { CellData, WHITESPACE_CELL_CHAR } from 'common/buffer/BufferLine';
 
 class TestTerminal extends Terminal {
   innerWrite(): void { this._innerWrite(); }