Merge pull request #24 from rubicks/ceeplusplus

changes link to and placement of screenshot.png
started refactoring a bunch of cut & paste code related to setting input field limits
Merge branch 'master' of https://github.com/Mortis69/rendera
finished refactoring a bunch of cut & paste code related to setting input field limits
used bitmap clip width/height vars where possible to clean thins up a bit