- #7156 part 1 of ?
- add `CompatibilityVersion.Version_3_0` and make it the default
- remove tests of old versions
- also remove `CompatibilityVersion.Version_2_x` uses outside src/Mvc
- for functional tests of legacy routing, use `MvcOptions.EnableEndpointRouting` to control behaviour
- rename `StartupWith2xCompat...` classes to `StartupWithoutEndpointRouting`
- clean up comments mentioning `[Obsolete]` `CompatibilityVersion` values
- many of the affected options will be removed in subsequent PRs but this cleanup helps when searching entire repo
- correct `<value>` comments in `ApiBehaviorOptions`
nits:
- take VS suggestions in changed files
- remove src/SiteExtensions/global.json and let file in repo root "win"
- fix a few grammar errors VS or the spell checker noticed
- move `<value>` elements before `<remarks>` for consistency
- was undoing unintentional changes and noticed the inconsistency in a couple of additional files
Doug Bunting
James Newton-King
Ryan Brandenburg