Add "Enable experimental features" option. Does nothing at the moment.
Hide Skeleton layer if "Enable experimental features" option is disabled
Display warning message if experimental features are enabled
temporary fix. in future we should to change type of return value of
method clone() to ValueNode::Handle
Little fix
typo
Update valuenode_step.cpp

Fix spelling of word
Revert image layer icon (use version from 0.64.0)
Win32 build: Make sure we have correct working directory for application shortcut
Typo
Reformat warning text a bit
Fix placement of "single threaded" checkbox
Win32: Fix ffmpeg binary detection (one more time)
Exclude from rendering: Action now changes its label depending on the current layer status
Merge pull request #72 from morevnaproject/0.64.1

0.64.1 fixes