This reverts commit 2044d5dcd979b2b0badd5c9b8b19028490ea4586.

Fix dependencies for Debian Stretch/Sid

Because libtiff4 was in wheezy and not included in jessie, stretch and sid.

- open method assumes .sifz format when file has no valid extension -
this leads to synfig stu...

- cleanup
- partial CMake support
- copyright update (fixes #313)

This is the same as 00954d9ab6ed648104033f6793d7181befadef18 fix
for dynamic list.

This reverts commit b19da8dd629ca14b2bc0c067e70dfde1eb5741c4.

Fixes #236

Fixes #227

By using Frame instead of Button we avoid intrusive Gtk themes
from forcing huge dro...

Thanks to @adrian5

This removes more compiler warnings over code we don't control.

This fixes ImageMagick warnings generated due to CMake ImageMagick
module lacking flag detection.

This lets ETL use supposedly more safe variant of str formating
functions and thus makes compile...

NOTE: you'll have to re-run cmake for synfig-core

Replace manual valuenode type registering in valuenode.cpp with
semi-automatic based on macros p...

Now all valuenode types in main tree (i.e. not provided by modules)
are using new automatic regi...

- No more ValueNode::subsys_init/subsys_stop
- Clean up valuenode.cpp includes

This is required because otherwise crash happens due to some
create() functions having canvas as...

- eliminates necessity to modify valuenode classes
- fixes multiple inheritance problems

Now al...

- move into separate files
- get rid of unused canvas value in create() method
- add macros for ...

- rename create functions to avoid confusion
- get rid of create_from special case

mutex.cpp needs either libpthreads or win32, so make sure we
have this on compile step instead o...