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build: Add support for cmake and remove support for autotools

Description

build: Add support for cmake and remove support for autotools

* CMakeLists.txt, cmake/modules/FindGpgme.cmake,
cmake/modules/FindLibGpgError.cmake, src/CMakeLists.txt,
src/GpgmeppConfig-msvc.cmake.in.in: New.
* Makefile.am, autogen.rc, autogen.sh, build-aux/compile,
build-aux/config.guess, build-aux/config.sub, build-aux/depcomp,
build-aux/install-sh, build-aux/libtool-patch.sed, build-aux/ltmain.sh,
build-aux/missing, build-aux/mkinstalldirs, configure.ac,
m4/ax_cxx_compile_stdcxx.m4, m4/ax_gcc_func_attribute.m4,
m4/gpg-error.m4, m4/gpgme.m4, m4/libtool.m4, m4/ltoptions.m4,
m4/ltsugar.m4, m4/ltversion.m4, m4/lt~obsolete.m4, src/Makefile.am:
Remove.

This is based on work done by Daniel Vrátil and Carl Schwan for KDE's
Craft. FindLibGpgError.cmake is copied from libkleo. FindGpgme.cmake is
new.