feat: first chunk of lexer/parser translation.

InkBlot/InkBlotAntlrLexer.g4

@@ -1,6 +1,11 @@
 lexer grammar InkBlotAntlrLexer;
 
-Whitespace: [ \t]+ ;
+// classic "white space" and "new line" - ink's new line also allows for some whitespace at start
+WS: [ \t]+ ;
+NL: WS? '\r'? '\n' ;
+
+// one or more (potential whitespace followed by) newline(s); used e.g. for block sequencing
+MULTILINE_WS: NL+ ;
 
 // see InkParser_Content.cs, ContentTextNoEscape and ContentTextAllowingEcapeChar for the escape case
 // this works for the base case where we're not parsing a string, nor a choice 
@@ -19,4 +24,24 @@ CONTENT_TEXT_NO_ESCAPE_SIMPLE:
     | '-' { InputStream.LA(1) != '>' }?
       // same for threads (<-) and glue (<>)
     | '<' { InputStream.LA(1) != '-' && InputStream.LA(1) != '>' }?
-    )+ ;
+    )+ ;
+
+INLINE_LOGIC_START: '{' ;
+INLINE_LOGIC_END: '}' ;
+
+// All symbols for sequencing: either using the short-hand symbols (https://github.com/inkle/ink/blob/master/Documentation/WritingWithInk.md#types-of-alternatives)
+// or using the multiline blocks (https://github.com/inkle/ink/blob/master/Documentation/WritingWithInk.md#multiline-blocks)
+SEQUENCE_TYPE_SYMBOL_ANNOTATION: [!&~$ ] ;
+ONCE: 'once' WS? ':' ;
+CYCLE: 'cycle' WS? ':' ;
+SHUFFLE: 'shuffle' WS? ':' ;
+STOPPING: 'stopping' WS? ':' ;
+SHUFFLE_ONCE: 'shuffle' WS 'once' WS? ':' ;
+SHUFFLE_STOPPING: 'shuffle' WS 'stopping' WS? ':' ;
+
+THREAD_ARROW: '<-' ;
+DIVERT_ARROW: '->' ;
+TUNNEL_ARROW: '->->' ;
+
+// TODO: add all extra character ranges from InkParser_CharacterRanges (LatinBasic, LatinExtendedA, ...)
+IDENTIFIER: [A-Za-z0-9_]+;