Adapted preferences.xml to new classpath structure.
Added licenses preference that was lost in between some commits.
Added hard-coded auto link to text asset activity so non-html links that
start in "http://", etc. are clickable.
Updated privacy policy
Implemented "Email developer" preference.

In order to realize this, 
- the WebView Acitivty was extended to process mailto: links by
localizing @string resources before passing on as SENDTO intent,
- TextUtil's replaceResourceStrings() is now more generic and public and
- the version string was moved from manifest to constants.xml, and can
now be used as @string/versionName
Removed "unsupported tags" notification from log for<html><head><title>