Reduce 2 more KB usage by replacing float with int

added Wilco_sqrt as integer function and removed all other usage of float.
should also increase speed significantly.
Code memory 6.3K -> 9K -> 11K
Run-time Available RAM 5.1K -> 7.8K -> 9.9K
Run-time Used RAM 2.4K -> 3K
Total available for new code increased: 2.7K ->4.8K -> 6.9K