Adding some basic of F#

[georga399]

Adding F# grammar.

[KvanTTT]

Big thanks for the new grammar and welcome to ANTLR grammars!

But please fix the following things:

• Get rid of not needed parentheses
• Factor out common parts
• Split operators by whitespaces

[KvanTTT]

Please get rid of not needed parentheses:

Suggested change

	BLOCKCOMMENT: ('(*' .*? '*)') -> channel(HIDDEN);
	BLOCKCOMMENT: '(*' .*? '*)' -> channel(HIDDEN);

[KvanTTT]

Please factor out common parts:

Suggested change

	INT: [0-9]+('uy'|'y'|'s'|'us'|'u'|'L')?;
	INT: [0-9]+ ('u' ('y' | 's')? | 'y' | 's' | 'L')?;

[KvanTTT]

Suggested change

	INTERPOLATIONSIGN: '%s'|'%d'|'%f'|'%c';
	INTERPOLATIONSIGN: '%' ('s' | 'd' | 'f' | 'c');

[KvanTTT]

Please split operators by whitespaces (exclusing parentheses):

Suggested change

	CHAR: '\''(~[\\']|'\\'['"nt\\]|'\\u'[0-9a-fA-F][0-9a-fA-F][0-9a-fA-F][0-9a-fA-F])'\'';
	CHAR: '\'' (~[\\'] | '\\' ['"nt\\] | '\\u' [0-9a-fA-F][0-9a-fA-F][0-9a-fA-F][0-9a-fA-F]) '\'';

It improves grammar reading experience and fits other grammars' code-style.

[KvanTTT]

Suggested change

	FLOAT: [0-9]+'.'[0-9]+ ('f'|'m')?;
	FLOAT: [0-9]+ '.' [0-9]+ ('f'|'m')?;

[KvanTTT]

Suggested change

	enum: (VERTICAL_LINE dotIentifier (equal|of) dotIentifier)+;
	enum: (VERTICAL_LINE dotIentifier (equal | of) dotIentifier)+;

[KvanTTT]

Suggested change

	record: OPEN_BRACE (((expression COLON dotIentifier) *)| (expression* with expression*)) CLOSE_BRACE;
	record: OPEN_BRACE ((expression COLON dotIentifier)* | expression* with expression*) CLOSE_BRACE;

[KvanTTT]

Suggested change

	with_get_set: (WITH ((private|internal|public)? GET UNIT EQUAL expression)
	(AND ((private|internal|public)? SET expression* EQUAL expression)?)
	| (WITH (private|internal|public)? expression* EQUAL expression));
	with_get_set: WITH visibilityModifier?
	( GET UNIT EQUAL expression AND (visibilityModifier? SET expression* EQUAL expression)?
	| expression* EQUAL expression
	)
	;
	visibilityModifier: private | internal | public;

[KvanTTT]

Suggested change

	of:OF;
	of: OF;

[KvanTTT]

Suggested change

	### Grammar for F#
	Maybe some troubles with handling tabulation.
	Maybe some troubles with defining classes.
	### Grammar for F#
	Maybe some troubles with handling tabulation.
	Maybe some troubles with defining classes.