enhanced a function caller to take a string and find a function to execute it

added hawk_rtx_valtofun() and changed the asort implementation to use it

renamed hawk_rtx_cleario() to hawk_rtx_clearallios().

added true multidimensional map support for the for-in statement and the binary in operator

call-by-reference handling with a true multidimensional map

more true multidimensional map work

implementing deletion on true multi-dimensional map

implementing assignment with true multi-dimensional map

writing code for supporting true multi-dimensional indices in map

changed the point where hawk_rtx_cleario() is called for cleanup