TYPO3-Headless / headless / 6668208320

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[PoC][FEATURE] Introduce mixed mode for headless (#578)

* [FEATURE] Introduce mixed mode for headless

Patch introduces new way for checking if we are in headless mode, you can set not enabled, mixed mode (fluid & headless at the same time), or full headless mode.

To configure headless mode, please use site configuration flag, for example:
`
   'headless': 0|1|2
`
Legacy flag (true|false) is respected, but please migrate to integer notation

Possible options:
 0 (old: false) = headless disabled for site in TYPO3 instance
 1 (old: true) = headless fully enabled site in TYPO3 instance
 2 = headless in mixed mode (fluid & json API in one site in TYPO3 instance)

Values 0 (old: false) or 1 (old: true) inform extension to fully disable/enable headless for particular site.

To enable mixed mode for chosen site in TYPO3 you need to:
- In typoscript template for site, you have to load "Headless - Mixed mode JSON response" setup file instead of default headless one.
- set `headless` flag to value of `2` site configuration's file or configure flag via editor in Site's management backend

Mixed mode flag (value of `2`) inform EXT:headless extension to additionally check for `Accept` header with value `application/json` when processing request to the particular site in TYPO3 instance.

In case of request without `Accept` header or `Accept` with different value than `application/json` TYPO3 will respond with HTML content (standard TYPO3's response)
In case of request with header `Accept` match value of `application/json`, TYPO3 will respond with JSON response.

resolves #94 #578 #348

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