Merge pull request #16 from bigmouth/Feature_RestructuringSDK3_3

http://c2.com/cgi/wiki?OneMoreLevelOfIndirection
Updates iOS samples;

Signed-off-by: Andreas Schacherbauer <andreas.schacherbauer@wikitude.com>
Updates Android samples;

Signed-off-by: Andreas Schacherbauer <andreas.schacherbauer@wikitude.com>
Updates sample application MainWindow to include new samples;

Signed-off-by: Andreas Schacherbauer <andreas.schacherbauer@wikitude.com>
Merge pull request #17 from AndreasSchacherbauerWikitude/Feature_RestructuringSDK3_3

Updates Android & iOS sample content;
Fix: callback function names,