Deprecation: #68098 - Deprecate GeneralUtility methods 

See forge#68098

Description 

The following methods within GeneralUtility have been marked as deprecated and will be removed in TYPO3 CMS v8.

GeneralUtility::modifyHTMLColor()
GeneralUtility::modifyHTMLColorAll()
GeneralUtility::isBrokenEmailEnvironment()
GeneralUtility::normalizeMailAddress()
GeneralUtility::formatForTextarea()
GeneralUtility::getThisUrl()
GeneralUtility::cleanOutputBuffers()
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The functionality formatForTextarea() was used in the older days to actually support IE4 and Netscape 3 properly and can now safely be exchanged by htmlspecialchars().

Impact 

All extensions using these methods directly will throw a deprecation message.

Affected Installations 

Installations with extensions that use the methods above handling.

Migration 

Use corresponding functionality from getIndpEnv() instead of getThisUrl().

For the other methods, you can re-implement the functionality yourself in your extension where needed.