Add RuleContext interface methods to reserved words

[jasonmoo]

This fixes #2080 by adding all method names from the RuleContext interface definition to the reserved words list. Arguably this is a quick fix and not a full solution, but should help avoid some headaches in the mean time.

type Tree interface {
	GetParent() Tree
	SetParent(Tree)
	GetPayload() interface{}
	GetChild(i int) Tree
	GetChildCount() int
	GetChildren() []Tree
}

type SyntaxTree interface {
	Tree

	GetSourceInterval() *Interval
}

type ParseTree interface {
	SyntaxTree

	Accept(Visitor ParseTreeVisitor) interface{}
	GetText() string

	ToStringTree([]string, Recognizer) string
}

type RuleNode interface {
	ParseTree

	GetRuleContext() RuleContext
	GetBaseRuleContext() *BaseRuleContext
}

type RuleContext interface {
	RuleNode

	GetInvokingState() int
	SetInvokingState(int)

	GetRuleIndex() int
	IsEmpty() bool

	GetAltNumber() int
	SetAltNumber(altNumber int)

	String([]string, RuleContext) string
}

[parrt]

This only changes the keywords but it does look like one of the test is failing. I will wait to see if the latest build is clean before checking this again.

[ewanmellor]

The test failure was in the .NET tests (#2078). I've re-run it; it will probably pass the second time.

[jasonmoo]

Thanks1