Emit a guard newline in TextareaElement to preserve leading newlines

A browser's HTML parser ignores a single newline immediately after a
<textarea> start tag, so a value whose first character is a

Emit a guard newline in TextareaElement to preserve leading newlines

A browser's HTML parser ignores a single newline immediately after a
<textarea> start tag, so a value whose first character is a newline lost
it on round-trip (e.g. saving a page or section whose source starts with
a blank line silently dropped that line).

Emit a guard newline right after the start tag so the one the browser
drops is absorbed and the value stays intact.

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Move PSR compliant tests to the apropriate namespaces

Having "inc" in the namespace is awkward. Instead the test class
namespaces now correspond to their real class namespaces.

With further refacto

Move PSR compliant tests to the apropriate namespaces

Having "inc" in the namespace is awkward. Instead the test class
namespaces now correspond to their real class namespaces.

With further refactorings we should get rid of most of the stuff in
tests/inc

this is a continuation of #3812

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