Add DPI-Aware Manifests for High DPI Support

add dpi-aware manifest to BrowserSubprocess and WinForms.Example
projects
update .gitignore to allow .manifest files
Add ability to specify `FromText` Encoding and Preamble (without a preamble then Cef will use DefaultEncoding to render the html)
Add `LoadHtml` overrides with Encoding param (default is UTF-8)
Add ResourceHandler unicode example to CefExample
Spelling mistakes
Merge pull request #691 from amaitland/enhancement/resourcehandler-encoding

Enhancement - ResourceHandler Encoding
Merge pull request #664 from jimnoble/master

Add DPI-Aware Manifests for High DPI Support
Reformat app.manifest files - was too verbose
Update assemblyIdentity to include correct version and app name
Save the internal byte array of MemoryStream from being expanded unnecessarily as per https://github.com/cefsharp/CefSharp/pull/691#issuecomment-67116871
Add NavstateChanged EventHandler to OffScreen
Merge remote-tracking branch 'remotes/upstream/master' into cef/2171