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fixes oss-fuzz/9614

AnnotLine::initialize used to look for strings, which is wrong,
because PDF reference says "LE [...] An array of two names".

And don't feel like investigating why

This is the name used by std::string.

Line endings are already parsed from /LE array and are gettable and
settable as enum value in current APIs.

With this commit we implement the drawing operations so that line
endings become actually visible when document is rendered.

Enables levels 0, 1 and 2, along with some manual ones
Disables non-pod-globa-static, StructElement would need some rework to
fix it and it's only a bit about optimization of start time, we can live
with it

Since they are part of the API

Makes clazy happier

We don't have any signals or slots at the moment but add the keyword so
if we ever add them it's using the Q_SIGNAL/Q_SLOT variant so we don't
get collisions with other people that use signal/slot

Scopes the entry variable so people don't try to use it in between

Closes #660

Closes #661

Closes #659

PopplerAttachmentPrivate has a Object member which
was never destructed, only set to an empty Object()
on dispose. While there is no memory leak (currently!),
this is still not correct.

Fix this by making  PopplerAttachmentPrivate a C++ class,
constructed in place of the gobject instance private in
init(), and call the destructor explicitly in finalize().

fixes oss-fuzz/11244

Mark objects being processed in Parser::makeStream() as being processed
and check the mark when entering this method to avoid processing
of the same object recursively.

When a checkbox had no /AP key (which is not mandatory)
poppler was silently ignoring the setState() call that
changes the checked/unchecked state.

Fixed by using getOnStr() instead of accessing onStr
directly, as the former has code in place to return
correct values when the field is a checkbox and has
no names for the On/Off states (as a result of not
having the /AP key which could contain those names).

A testcase is included. An example definition of an
affected checkbox follows:

/F 4
/FT /Btn
/H /P
/MK /BC [1,0,0] /BG [1,1,1] /CA (4)
/Q 0
/Rect [235.277,654.247,249.224,668.194]
/Subtype /Widget
/T (basiccheckbox)
/Type /Annot
/V /Off

Fixes issue #655

to avoid using PS memory on cairo >= 1.5.10