ELECTRON-299: upgrade to Electron 1.7.12
ELECTRON-299: upgrade to Electron 1.7.12

Electron 1.7.12 adds a security fix for windows apps.

VishwasShashidhar/SymphonyElectron,VishwasShashidhar/SymphonyElectron,KiranNiranjan/SymphonyElectron,KiranNiranjan/SymphonyElectron,VishwasShashidhar/SymphonyElectron,KiranNiranjan/SymphonyElectron,KiranNiranjan/SymphonyElectron,VishwasShashidhar/SymphonyElectron