Restore extensions in core (#114921)

* bring back grammar extensions

* fix hygiene

* Revert "pull themes from the marketplace"

This reverts commit 0738f76dac.

extensions/objective-c/.vscodeignore

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+test/**
+cgmanifest.json

extensions/objective-c/build/update-grammars.js

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+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the MIT License. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+'use strict';
+
+var updateGrammar = require('../../../build/npm/update-grammar');
+
+updateGrammar.update('jeff-hykin/cpp-textmate-grammar', '/syntaxes/objc.tmLanguage.json', './syntaxes/objective-c.tmLanguage.json', undefined, 'master', 'source/languages/cpp');
+updateGrammar.update('jeff-hykin/cpp-textmate-grammar', '/syntaxes/objcpp.tmLanguage.json', './syntaxes/objective-c++.tmLanguage.json', undefined, 'master', 'source/languages/cpp');
+

extensions/objective-c/cgmanifest.json

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+{
+	"registrations": [
+		{
+			"component": {
+				"type": "git",
+				"git": {
+					"name": "jeff-hykin/cpp-textmate-grammar",
+					"repositoryUrl": "https://github.com/jeff-hykin/cpp-textmate-grammar",
+					"commitHash": "bc7dedd28eebe52b374744d3fb34d77ff441569e"
+				}
+			},
+			"license": "MIT",
+			"version": "1.12.11",
+			"description": "The files syntaxes/objective-c.tmLanguage.json and syntaxes/objective-c++.tmLanguage.json were derived from the language package https://github.com/jeff-hykin/cpp-textmate-grammar."
+		}
+	],
+	"version": 1
+}

extensions/objective-c/language-configuration.json

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+{
+	"comments": {
+		"lineComment": "//",
+		"blockComment": [ "/*", "*/" ]
+	},
+	"brackets": [
+		["{", "}"],
+		["[", "]"],
+		["(", ")"]
+	],
+	"autoClosingPairs": [
+		["{", "}"],
+		["[", "]"],
+		["(", ")"],
+		{ "open": "\"", "close": "\"", "notIn": ["string"] },
+		{ "open": "'", "close": "'", "notIn": ["string"] }
+	],
+	"surroundingPairs": [
+		["{", "}"],
+		["[", "]"],
+		["(", ")"],
+		["\"", "\""],
+		["'", "'"]
+	]
+}

extensions/objective-c/package.json

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+{
+	"name": "objective-c",
+	"displayName": "%displayName%",
+	"description": "%description%",
+	"version": "1.0.0",
+	"publisher": "vscode",
+	"license": "MIT",
+	"engines": {
+		"vscode": "*"
+	},
+	"scripts": {
+		"update-grammar": "node ./build/update-grammars.js"
+	},
+	"contributes": {
+		"languages": [
+			{
+				"id": "objective-c",
+				"extensions": [
+					".m"
+				],
+				"aliases": [
+					"Objective-C"
+				],
+				"configuration": "./language-configuration.json"
+			},
+			{
+				"id": "objective-cpp",
+				"extensions": [
+					".mm"
+				],
+				"aliases": [
+					"Objective-C++"
+				],
+				"configuration": "./language-configuration.json"
+			}
+		],
+		"grammars": [
+			{
+				"language": "objective-c",
+				"scopeName": "source.objc",
+				"path": "./syntaxes/objective-c.tmLanguage.json"
+			},
+			{
+				"language": "objective-cpp",
+				"scopeName": "source.objcpp",
+				"path": "./syntaxes/objective-c++.tmLanguage.json"
+			}
+		]
+	}
+}

extensions/objective-c/package.nls.json

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+{
+	"displayName": "Objective-C Language Basics",
+	"description": "Provides syntax highlighting and bracket matching in Objective-C files."
+}