updating with a separate app

[Terkwood]

goal

Applying the updates is horribly slow when PCK is large(700MB), probably due to ProjectSettings.load_resource_pack

Let's try creating a separate app

Look at Veloren's solution: https://github.com/Songtronix/Airshipper

impl

• separate os specific directory for the launcher
• imgui.rs
• bipatch cannot use multiple CPUs . https://github.com/divvun/bidiff/blob/master/crates/bipatch/src/lib.rs

[Terkwood]

Took 3 min to apply a 16MB patch to a 1GB game on a 2015 MBP

[Terkwood]

See #56