[FEATURE] Add extension version check method to Version Utility
[TASK] Add custom Grid template for use with EXT:gridelements 2.0+
[FEATURE] Overriding paths for Legacy and Gridelements templates

This change enables reading of TypoScript to respect overridden Flux template paths, allowing paths to the Legacy and Gridelements templates to be defined using TypoScript.
[TASK] Switch behaviour in ContentArea VH if Gridelements 2.0+ installed
Merge pull request #159 from NamelessCoder/gridelements_2-0

[FEATURE] Gridelements 2.0 Support
[TER] 6.0.0