Kind and sizes

[ZedThree]

Built on top of #87 to avoid massive conflicts, new commits are 354e376 onwards

Closes #86

• Separate kind suffixes on number literals so they appear in the syntax tree
• Rename the size node on types as kind to distinguish it from array sizes
• Parse sizes on variable declarations as size instead of call_expression
• Add variable node in variable_declaration to group the variable name and array size