Fix typo: easer -> easier
Add drag support

Add support for dragging via two new commands: dd:x,y (drag down)
and du:x,y (drag up). dd holds down the left mouse button at the
specified point to start a drag. du releases the left mouse button at
the specified point to end a drag.
Add “Will ” to beginning of move command description

All the other command descriptions start with “Will ”, so make the move
command description start with it too to be consistent.
Change some files’ order in the project
Add short delay before releasing

While testing, it turned out that this improves
reliability, for instance when dragging a document
proxy (titlebar) icon.
Merge branch 'typo' of https://github.com/jlmuir/cliclick
Merge branch 'consistency' of https://github.com/jlmuir/cliclick