Use @Action instead of Action

[Wikunia]

Is your feature request related to a problem? Please explain.
It's hard to write Actions with (args...)-> every time and using symbols for variables is a bit annoying.

Describe the solution you'd like

video = Video(600, 600)
@Action(1:60, id, func(my_args))
@Action(1:10, func(id))

javis(video; pathname="test.gif")

can be equivalent to:

javis(video, [
    Action(1:60, :id, (args...)->func(my_args))
    Action(1:10, (args...)->func(get_value(:id)))
])

but is much easier to read and write.

[Wikunia]

Idea for subactions:

@BackgroundAction(1:180, ground),      
a = @Action(1:180, id, draw_grid)
@SubAction(a, 1:60, appear(:lr, :tb))

[Wikunia]

I'm actually a bit against this as it #216 very hard and maybe users can get used to (args...)->. We can also have no arguments such that one can write ()-> and instead have functions like get_current_frame