* mirr0r filter added
* removed redundant and unused includes
* Using Cairo graphics library
* fixed parameters range
* Clear the screen before drawing, to avoid problems with image sources with transparency.
* Remove unused import
The following filters needed to be disabled because of
Variable Length Arrays (VLA), but are enabled when
compiling with clang-cl:
* curves
* d90stairsteppingfix
* dither
The configure script has helpers (e.g. ltmain.sh) that are included in a
tarball but not a git clone. Some of these helpers are required to deal with
a version of libtoolize used to generate configure that differs from the
version of libtool on the build machine.