FluidTYPO3 / flux / 12978690600

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[BUGFIX] Work around TS problem with uncached contexts

Rather than allowing TYPO3 to fail with a hard exception, we allow
Flux to operate in a limited-support mode where no TypoScript is
available. Although this isn't ideal, it's preferable to both alternatives:

1. Let TYPO3 throw an exception, making uncached operation completely
    impossible.
2. Recreating the 8-class-dependency, 260-lines-of-code, non-API
    TypoScript reading from PrepareTypoScriptFrontendRendering,
    which is both final and readonly and completely impossible to extend.

"Fun" fact: TYPOv13 no longer has any short-API way of reading TypoScript
unless it is put into ServerRequest->attributes['frontend.typoscript'] -
and this simply does not happen in uncached (INT) contexts. Great.

There's no service, no utility, no API. The only way is to manually fetch
and parse every TS template from the root line and use the significantly
complex AST-based parsing mechanism.

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