Split up code from pitivi/ to subdirectories
@bilboed
Submitted by Edward Hervey Assigned to Edward Hervey @bilboed
Description
The pitivi/ directory is currently crammed with plenty of code that should move to sub-directories for better readability.
For ex, all timeline code should go in a timeline/ subdirectory, and split up in smaller files for better readability.
Imported from https://bugzilla.gnome.org/show_bug.cgi?id=396808