TOSA Specification v0.70.0 release tag

Formalize the description of arguments in tosa.xml
Generate more from the tosa.xml file.
	Rank requirements for arguments
	Maximums for each TOSA level.
Updated Main Inference floating-point conformance testing
Add enumerations to TOSA specification
	Accumulator size
	Resize type
Replace uint6_t with int8_t
	Stick to more common types.
	Where uint6_t was used has range restrictions so existing implementations do not require changes
Improve description of the execution model for TOSA
Minor cleanup