PdfParser: Removed leftover of legacy invalid password handling

It's incorrect now

Bump to 1.0.1

Fix more issues related to use of nullable<std::unique_ptr<T>>

Also introduce a operator*= for nullable that allow to force assignment
on the nullable with inner type arguments. This allows to avoid picking
wrong overloads

XMPUtils: Fixed unused warning

PdfFontConfigWrapper: Put the constructor with FcConfig* argument und…

…er guard by the PODOFO_3RDPARTY_INTEROP_ENABLED macro

StringTest: Disable a recent failing test backported from 1.0 that wo…

…n't work in 0.10.x

Install PoDoFo exports config files to "lib/cmake/podofo"

PoDoFo would also search in "share/cmake/podofo", but[1] documents
the former

[1] https://cmake.org/cmake/help/latest/guide/tutorial/Adding%20Export%20Configuration.html

Updated CHANGELOG.md

Updated API-MIGRATION.md

PdfPainter: Fix SetCurrentMatrix() to really update CTM

Also see b223aec in master