FEATURE: Add first TypoScript sniff

* Add configuration for removed object identifiers.
* Add sniff for removed object identifiers.

Relates: #54

src/Standards/Typo3Update/Configuration/Removed/TypoScript/ObjectIdentifier/7.0.yaml

+# Breaking changes in 7.0: https://docs.typo3.org/typo3cms/extensions/core/7.6/Changelog/7.0/Index.html#breaking-changes
+'7.0':
+  styles.insertContent:
+    replacement: 'Either remove usage of styles.insertContent or add a snippet at an early point in TypoScript for backwards compatibility'
+    docsUrl: 'https://docs.typo3.org/typo3cms/extensions/core/7.6/Changelog/7.0/Breaking-42543-DefaultTypoScriptRemoved.html'

src/Standards/Typo3Update/Sniffs/Removed/TypoScriptObjectIdentifierSniff.php

+<?php
+
+use Helmich\TypoScriptParser\Tokenizer\TokenInterface;
+use PHP_CodeSniffer_File as PhpCsFile;
+use Typo3Update\Sniffs\Options;
+use Typo3Update\Sniffs\Removed\AbstractGenericUsage;
+
+class Typo3Update_Sniffs_Removed_TypoScriptObjectIdentifierSniff extends AbstractGenericUsage
+{
+    public $supportedTokenizers = [
+        'TYPOSCRIPT',
+    ];
+
+    /**
+     * Returns the token types that this sniff is interested in.
+     *
+     * @return array<int>
+     */
+    public function register()
+    {
+        return [
+            TokenInterface::TYPE_OBJECT_IDENTIFIER,
+        ];
+    }
+
+    /**
+     * Check whether the current token is removed.
+     *
+     * @param PhpCsFile $phpcsFile
+     * @param int $stackPtr
+     * @return bool
+     */
+    protected function isRemoved(PhpCsFile $phpcsFile, $stackPtr)
+    {
+        $tokens = $phpcsFile->getTokens();
+        $token = $tokens[$stackPtr];
+        $objectIdentifier = $token['content'];
+
+        if (isset($this->configured[$objectIdentifier])) {
+            $this->removed = [
+                $this->configured[$objectIdentifier]
+            ];
+            return true;
+        }
+
+        return false;
+    }
+
+    /**
+     * Identifier for configuring this specific error / warning through PHPCS.
+     *
+     * @param array $config
+     *
+     * @return string
+     */
+    protected function getIdentifier(array $config)
+    {
+        return str_replace('.', '-', $config['name']);
+    }
+
+    /**
+     * The original call, to allow user to check matches.
+     *
+     * As we match the name, that can be provided by multiple classes, you
+     * should provide an example, so users can check that this is the legacy
+     * one.
+     *
+     * @param array $config
+     *
+     * @return string
+     */
+    protected function getOldUsage(array $config)
+    {
+        return $config['name'];
+    }
+
+    /**
+     * Return file names containing removed configurations.
+     *
+     * @return array<string>
+     */
+    protected function getRemovedConfigFiles()
+    {
+        return Options::getRemovedTypoScriptObjectIdentifierConfigFiles();
+    }
+}

tests/Fixtures/Standards/Typo3Update/Sniffs/Removed/TypoScriptObjectIdentifierSniff/Expected.json

+{
+    "files": {
+        "InputFileForIssues.ts": {
+            "errors": 0,
+            "messages": [
+                {
+                    "column": 10,
+                    "fixable": false,
+                    "line": 2,
+                    "message": "Legacy calls are not allowed; found styles.insertContent. Removed in 7.0. Either remove usage of styles.insertContent or add a snippet at an early point in TypoScript for backwards compatibility. See: https://docs.typo3.org/typo3cms/extensions/core/7.6/Changelog/7.0/Breaking-42543-DefaultTypoScriptRemoved.html",
+                    "severity": 5,
+                    "source": "Typo3Update.Removed.TypoScriptObjectIdentifier.styles-insertContent",
+                    "type": "WARNING"
+                },
+                {
+                    "column": 11,
+                    "fixable": false,
+                    "line": 3,
+                    "message": "Legacy calls are not allowed; found styles.insertContent. Removed in 7.0. Either remove usage of styles.insertContent or add a snippet at an early point in TypoScript for backwards compatibility. See: https://docs.typo3.org/typo3cms/extensions/core/7.6/Changelog/7.0/Breaking-42543-DefaultTypoScriptRemoved.html",
+                    "severity": 5,
+                    "source": "Typo3Update.Removed.TypoScriptObjectIdentifier.styles-insertContent",
+                    "type": "WARNING"
+                }
+            ],
+            "warnings": 2
+        }
+    },
+    "totals": {
+        "errors": 0,
+        "fixable": 0,
+        "warnings": 2
+    }
+}

tests/Fixtures/Standards/Typo3Update/Sniffs/Removed/TypoScriptObjectIdentifierSniff/InputFileForIssues.ts

+page {
+    10 < styles.insertContent
+    10 =< styles.insertContent
+}