Merge pull request microsoft#3508 from keveleigh/spell-check

Pre-beta2 spell check pass

Merge pull request microsoft#3502 from Railboy/mrtk_inspector_upgrade

MixedRealityToolkit Profile Inspector

Merge pull request microsoft#3417 from davidkline-ms/htkCherryPick

comment updates

Merge pull request microsoft#3187 from Microsoft/htk_development

Move editor controller model fix from htk_dev to master for release

Merge pull request microsoft#3047 from Microsoft/mrtk_2018beta_stabil…

…ization

MRTK 2018 vNext Beta (2018.9.0) -> mrtk_release

Merge pull request microsoft#2900 from Microsoft/htk_development

Merge 2017.4.2 release from htk_development to master

Merge pull request microsoft#2646 from Microsoft/mrtk_development

Mrtk development -> mr dev summit

Merge pull request microsoft#2640 from StephenHodgson/vNEXT-VsCodeIgnore

Added .vscode to ignore file

Merge pull request microsoft#2575 from Microsoft/mrtk_development

MRTK vNext v2018.7 release branch refresh

Merge pull request microsoft#2530 from Microsoft/june18_dev

2017.4.1 Stabilization and Merge PR