[WIP] Reorganization + Applet Support

[misson20000]

Closes #5. Finally. :eyes:

Summary

Many parts of Twili have been moved to separate directories.

• twib: PC-side bridge client
• twili: Main twili sysmodule
  • twili/bridge: Bridge code
  • twili/bridge/interfaces: Twib endpoints
  • twili/bridge/tcp: TCPBridge implementation
  • twili/bridge/usb: USBBridge implementation
  • twili/ipcbind: Renamed from service, contains IPC client code for various services
  • twili/msgpack11: msgpack11 submodule
  • twili/process: Process management code. Most of this stuff is new.
  • twili/process/fs: Virtual filesystem code
  • twili/service: IPC service code
• twili_applet_shim: Applet code
• twili_common: Code common between two or more of twili, twili_applet_shim, or twili_launcher.
• twili_launcher: Deprecated twili launcher applet.

Process management has been greatly reorganized.

• Process: Base class. Exposes GetPid, AddNotes, and Terminate.
  • MonitoredProcess: Process started by Twili.
  • ManagedProcess: This is what used to be MonitoredProcess. These are the processes that hide from pm and are managed by Twili.
  • AppletProcess: Library applet managed by am/pm.
  • UnmonitoredProcess: Shim for quick operations on arbitrary processes.

Applet Summary

twili_applet_shim overrides the album applet. When it is launched, it connects to Twili and opens an IAppletShim. Twili checks against the AppletTracker to see if it already has a "control applet". If it does not, the twili_applet_shim becomes a control applet, which waits for messages from Twili. When an AppletProcess is Launch()ed, it is added to a queue in AppletTracker and a message is sent to the control applet to spawn another instance of twili_applet_shim through am's ILibraryAppletCreator interface, and to use a new loader extension to request that the loader add enough extra memory to fit the target process image in. When this instance of twili_applet_shim opens its IAppletShim, since Twili already has a control applet, it will then check if there are any AppletProcesses queued. If there are, the new twili_applet_shim becomes a "host" applet. The target process image is loaded into the host applet and it jumps to the entrypoint.

Todo

• [x] Get the Atmosphere extension merged.
• [x] Add a command line option to twib to specify whether to launch as an AppletProcess or a ManagedProcess.
• [x] Have the control applet inform Twili of errors when launching applets.
• [x] Have the control applet inform Twili when a host applet exits.
• [x] Defer the ITwibDeviceInterface::Run response until after the host applet attaches and we know the PID.
• [x] Fix on 5.0.0.
• [ ] More docs.

[todo[bot]]

report error back to Twili

https://github.com/misson20000/twili/blob/a173b7c0daf9e53737507f37b3ec508bd5297e53/twili_applet_shim/twili_applet_shim.cpp#L137-L142

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This comment was generated by todo based on a TODO comment in a173b7c0daf9e53737507f37b3ec508bd5297e53 in #52. cc @misson20000.

[misson20000]

NOTE: I've merged this into master even though it's not quite working yet with the new changes.