* Introduce Stype, a generalized object for producing synts by text matching
* consistently use stype to determine what can be inserted in a given place
* rewrite SyntDesc to more extensively use Stypes
* Introduce SyntHole, a generalized anyblob that can be put anywhere and evals
to failure
* Remove all data types but flags, introduce bots
* Remove math
* Remove compiler / VM
* Remove unused methods