OR DSL method Syntax should be more consistent.

[bd82]

currently each alternative may be specified as

{ALT: () => {...}}
{WHEN: predicate, THEN_DO: () => {...}}

Should consider replacing the THEN_DO with ALT

{WHEN: predicate, ALT: () => {...}}

• How does this affect the Gast builder?
• This is a pretty big breaking change... (although its better to break things now before V1.0.0...)

[bd82]

Will Change it to:

{ALT: () => {...}}
{GATE: predicate, ALT: () => {...}}

So the ALT property is always the grammar "action" to perform.
And the GATE property has a more meaningful name.

This is a breaking change so any use of:

{WHEN: predicate, THEN_DO: () => {...}}

must be replaced with:

{GATE: predicate, ALT: () => {...}}