Number-to-ByteVector-conversion (#44)

# Number and ByteVector conversions

Adds the following to isa conversions between data types, as well as tests for each:

- `NTOBV` Number To ByteVector - takes a mutable memory address with a Number and replaces this value with a ByteVector of the same numerical value
- `BVTON` ByteVector To Number - takes a mutable memory address with a ByteVector and replaces this value with a Number of the same numerical value as the ByteVector's value

Reviewed-on: #44
Co-authored-by: Kolby Heacock <codeshiftster@gmail.com>
Co-committed-by: Kolby Heacock <codeshiftster@gmail.com>

hyphae/vm.toml

@@ -641,6 +641,34 @@ character byte.
 Requires mutable access to input address.
 """
 
+[[instructions]]
+name = "ntobv"
+args = ["src"]
+output = ""
+description = """
+The ntobv instruction accepts a single number input. This operand is overwritten
+by a new number datum that represents the inexact form of the source number.
+
+The inexact form is a normalization of fraction or scientific notation datum to
+float datum casted to ByteVector datum.
+
+Requires mutable access to input address.
+"""
+
+[[instructions]]
+name = "bvton"
+args = ["src"]
+output = ""
+description = """
+The bvton instruction accepts a byte vector input. This operand is overwritten
+by a new number datum that represents the inexact form of the source byte vector.
+
+The normalized fraction or scientific notation data represented in a
+ByteVector datum is casted to an inexact floating point number.
+
+Requires mutable access to input address.
+"""
+
 [[instructions]]
 name = "ntoc"
 args = ["src"]