Make code changes to bring FW to v8.0.0

* Lots of comment changes on the order of 7.0 -> 7.0+
* Changes to icons so it shows 8 instead of 7
* Changes to Registry keys so they refer to FieldWorks/8
* Change to make the default Data directory FieldWorks, no number
* SuiteVersion = 8
* Bump version number to 8.0.0, including in Build/GlobalInclude
* Fix mkall.targets to generate keys with no trailing .0

Change-Id: I4a8956b65c6d22ff9140a4addb65ae490676abc0