UE-8509 Android SDK Paths being saved even if the user doesn't set them
- removed initial pull of data on start up
[CL 2425929 by Ben Marsh in Main branch]
- Added class to hold values (AndroidSDKSettings)
- Added code to Android editor module to setup the values on load
- Changed device detection so that the thread is always started and the SDK path can be changed on the fly
- Changed Platform Target Management Module so that a single platform can be checked via UBT
- Settings can now be sourced from an ini file via temp direct reading code (auto seralisation is disabled until later changes are made)
-- Settings currently not exposed in editor
- Added Mac Environment var setting support
Unreleated
- Envars can now be passed down to process start points in tools
#codereview michael.trepka
[CL 2412194 by Robert Jones in Main branch]
