Launch script for non python hosts

[iLLiCiTiT]

Description

Non python hosts Harmony, Photoshop and After Effects are currently launched with python command line commands which won't be possible in Pype 3 as there may not be any pyhton. To be able launch their scripts it is necessary to change launch mechanism and execute python script that start's host implementation.

Changes

• added script non_python_host_launch.py to "~/pype/scripts/" which is executed by pype's "run" command line command and resolves which launch function is used based on environment variable AVALON_APP
• individual prelaunch hooks for each host were removed and was added global prelaunch hook for these hosts
  • they should work for both pype from code and build pype

TODOs

• think about single launch script and prelaunch hook for non python hosts as they are same
• Test to launch each host from code and build pype
  • Harmony - code
  • Harmony - build
  • Photoshop - code
  • Photoshop - build
  • After Effects - code
  • After Effects - build

🏴	this depends on
avalon-core	ynput/avalon-core#280

[mkolar]

works well on all three hosts. Happy to merge

[mkolar]

I tested on source and build.