Support for parsing the address reference anywhere in the body

[rarris]

channel addresses are not supported in the rusty compiler

examples:
%IX
%QX
%GD

console errors:
error: Unexpected token: expected Literal but found %IX
error: Unexpected token: expected KeywordParensClose but found '%IX6.1'

[ghaith]

I think we will support this in several steps:

• Support for parsing the address reference anywhere in the body
• A new AST element is created, but the codegen will replace its value with 0
• Support for defining new address regions
• Regions can be defined as M<Size>, G<Size> or with simply a number
• The M region are locally shared data
• The G region are globally shared data, this region can be defined from the outside
• Numbered regions represent hardware, they can be accessed by either the I or Q symbols (%IX1.2) will access region 1 starting from bit 2
• Access into an address region will result in a pointer access
• A region in the body is simply a pointer access to that region defined by the rules of access (%MX2 is accessing bit 2 of the locally shared data)
• A region accessed in a variable declaration with AT marks that the variable being declared is an auto pointer to that location.