Hide special keys

There is no transition at present. Make it a drawer.
Added antilog

Added antilog both natural and to the base 10
Added trignometric functions

Added trignometric functions tan, sin, cos and their equivalent arc.
Change the version number
Added Shift button

Added shift button to toggle between special functions.
Need to find way to display both functions on the button.
Clean up
Merge branch 'shift' into scientific
Added ability to raise to different powers
Clean up

Clean up before merge with drawer
Merge branch 'drawer' into scientific

All special keys added and made invisible by keeping it in drawer.
Drawer animation to be added.
Applied license text to all files
Changed description