Bump GUI version to v0.5.2.1

Bump GUI version to v0.5.2

Merge pull request open-ephys#374 from anjaldoshi/patch/shared-directory

 Change plugin and shared directory location depending on GUI build type

Add Plugin Installer and new Recording architecture

Release 0.4.6

Binary Release v0.4.5 October 10, 2019

Binary Release v0.4.4 September 23, 2018

Binary hotfix 0.4.3.3

Binary Release v0.4.4 September 23, 2018