-Implements ResetInputChannels for ViewportController API and SetEnabled for ViewportControllerList
-Disables all viewport controllers while in game mode
the project root and engine root to fix issues with running the Editor
or AssetProcessor from within the project folder overriding the
project_path with the engine root bootstrap.cfg project_path entry
The order in which the project path is overridden as follows
1. The <engine-root>/bootstrap.cfg is first merged into the Settings
Registry. Any '/Amazon/AzCore/Bootstrap/project_path' would be used
if the following steps don't override that key.
2. Followed by general *.setreg/*.setregpatch files being merged into
the Settings Registry which can override the
'/Amazon/AzCore/Bootstrap/project_path' key
3. Next a project.json file searched upwards from the current executable
directory to determine the project path
4. Finally if a command line parameter that overrides the project path
is supplied it is used instead
amzn-sean
nvsickle
amzn-sj
mcgarrah
alexpete
greerdv
pereslav