Macro backstage::launcher

macro_rules! launcher {
    (@count $t1:tt, $($t:tt),+) => { ... };
    (@count $t:tt) => { ... };
    (
        builder: $name:ident {$( [$($dep:ty),*] -> $app:ident $(<$($a:tt),*>)? : $app_builder:tt$(<$($i:tt),*>)?  ),+},
        state: $apps:ident {$($field:ident : $type:ty),*}
    ) => { ... };
}

Creates a launcher application and its managed apps