Fix compilation for certain uses of Nullable parameters in vibe.web.web.
Fix WebInterfaceSettings.ignoreTrailingSlash with patterns ending with "*".
localize import of event driver libraries

- reduces parser work when recompiling vibe.d apps
localize some imports
Merge pull request #750 from MartinNowak/localizeImports2

localize some imports
Merge pull request #749 from MartinNowak/localizeImports

Localize import of event driver libraries.
Enable use of static event driver types using VibeUseNativeDriverType. See #749.
Added formEncode, urlEncode