convert member types in module backendconvert,
store pointer from field selector to member type in backend with BESetMemberTypeOfField

add BENumberedVarTypeNode and BENumberedTypeVar to set tv_argument_nr in type definitions,
add BESetMemberTypeOfField to store the member type of dictionary fields

add BENumberedVarTypeNode, BENumberedTypeVar and BESetMemberTypeOfField to backend dll/shared library
import and export files

add BESetMemberTypeOfField to store the member type of dictionary fields

used for type definitions, type_var_heap is passed to and from this function

remove more unused fields

function parseCommandLine in module compile removes these

prevent compiler crash when importing a generic function definition of a non generic representation type,
for which shorthand instances are generated

for non generic representation types, prevents error when comparing definitions
in implementation and definition module