Made HTTP Get requests asynchronous
Merge branch 'develop' of https://github.com/GlasslabGames/GlassLabSDK-cpp into develop

# By Ben Dapkiewicz
# Via Ben Dapkiewicz
* 'develop' of https://github.com/GlasslabGames/GlassLabSDK-cpp:
  requestType causes errors when moving up in version - added the requestType default in the corecallbackmap so we always know the value in those cases