StorageZip implementation
StorageZip: implemented crc32 and timestamps
Wrapper to work with files in container and files in common file system.
Static field in Importer to hold FileSystem object
FileSystemNative fix for windows
Add file system wrapper into mptr_bmp. Improve streams.
Callback to gather names of external files while saving.
temporary storage - FileContainerTemporary
Fix bugs in FileSystem classes
Add "container" field info Instance. Code broken
FileContainerTemporary: find path to temporary folder
FileContainerTemporary: remove unused static variable "tmp_directory__"
FileContainerZip: Move internal structs into synfig namespace from
global scope
FileContainerTemporary: allow to create temporary container without
holding zip-container
STL streams interfaces for FileSystem streams
Fix initialization order for FileContainerTemporary
Implement file_rename method (for FileSystemNative only)
save canvas via FileSystem wrapper
Fix save_canvas: close stream immediately after write XML
Load canvas via FileSystem wrapper