Fixes for parameter names of builtin functions in visual scripts/core
This PR fixes the difference between visual script and gdscript in parameter names of built-in functions. I renamed "val" to "value" in core gd_functions for better unification.. I also fixes some bugs:
Also inverse lerp should have "weight" instead "value"
so I changed it
The common functions like sin,cos,abs etc will accept "s" instead "num" in visual scripts, but if its not desired I could revert this change...