Started VL type generator

[srizvi6]

Wrote code (in generatorVL.ts) for creating a Mark object based on the Mark type in SourceFiles/SourceVLType.ts. Comitted to new branch VLgen.

Next steps:

• Continue to create the constructor block based on slack discussion as well as the rest of the types.
• Figure out generator architecture and internal representation to make the project smoother. A start is to separate the AST producing section and the code generation section.

[srizvi6]

Closing to clean up issues list