Parameternames changed for Datatype clarifications
Introducing OOP

- Introduced Pie-Object
- Pie-Object handles it base-creation
- Introduced createSliceMask and createSliceFill
- renamed "pie" to "sliceFill" for more accurate naming
- removed duplicate code through usage of createSliceMask and
createSliceFill
Introduced Method "rotateSlice"

- duplicate Code thorugh Method removed
- takes an HTML-Objekt and an Int value, rotates Objekt for value (all
Browser) and returns the rotated Object.
Further cleanup

- removed unneccessary code
- inserted explanatory comments in slices-creation