Update HandleBars version. Bump up CMake Tools Release version to mic…

…rosoft#1.2.3 (microsoft#947)

Update HandleBars version. Bump up CMake Tools Release version to microsoft#1.2.3

User defined generator has priority over any other selection criteria (…

…microsoft#906)

Merge pull request microsoft#878 from microsoft/develop

1.2.1: merge develop -> master

Merge pull request microsoft#872 from microsoft/develop

Merge develop -> master for 1.2.0