Product version upgrade to 0.7.6

- Updated BuildNumber to 6 in T4 template AssemblySharedInfo.tt
- Changed the Product Id for msi installer and bumped the version to
0.7.6
- Bumped exe installer version to 0.7.6 and put logic for msi uninstall
of 0.7.6
Merge pull request #3369 from Conceptual-Design/master

Product version upgrade to 0.7.6
Merge pull request #3370 from DynamoDS/master

Product version upgrade to 0.7.6