* Rewrite of Z80 assembling (still incomplete). I'm trying to move toward being able to test both parameters in such a way that can also build the correct opcode

* Continued to expand parsing of keywords

* Added an OZ80_INDEFINITE constant to mark when values are yet-unknown, this removes the need for passing `ValueIsIndefinite` booleans around and greatly simplifies a lot of handling of indefinite values

* Various enhancements to SYNTAX.txt

* Moved a lot of variables to RAM names in the disassembly

* Added an oz80 file that will be used for testing the parsing

* Added an Error property to the classes so that error numbers do not have to be passed around for everything

* Added a token flag to mark memory references `(...)` in the source code when sending tokens to the block to assemble

* Added basic XOR token parsing

* Added a status log level to display completed statements such as variable assignments

* Fixed missing entry in the ASCII enum

* Debug-level messages are sent to VB's console