Split up description text into smaller tokens so they have lowest precedence

Tokens that should appear at the start of a line are now prepended with EOL
to make them precise.

example

@@ -14,7 +14,7 @@ This description has # ' " [] symbols and ü © Ð Latin-1 chars.
 
 ## {1000} Second task
 
-This is the description of the second task.
+This is the description of the {} second task for project 10.
 
 *   {500} First subtask
-- {500} \2nd subtask
+- {500} 2nd subtask

takentaal.g4

@@ -17,14 +17,17 @@ grammar takentaal;
 takentaal
     : header
       plan
+      EOL*
     ;
 
 header
     : 'takentaal v0.1.0'
     ;
 
+// Any implicit and explity lexer token that may appear in a text should be listed
+// in this definition.
 text
-    : (S | CHAR | WORD)+
+    : (INT | '{' | '}' | S | CHAR | WORD)+
     ;
 
 plan
@@ -49,7 +52,7 @@ subtask
     ;
 
 amount
-    : START_AMOUNT S* INT END_AMOUNT
+    : '{' S* INT '}'
     |
     ;
 
@@ -62,23 +65,23 @@ TASK_TOKEN
     ;
 
 SUBTASK_TOKEN
-    : EOL+ (SUBTASK_NEW_TOKEN | SUBTASK_PARTIAL_TOKEN | SUBTASK_COMPLETE_TOKEN | SUBTASK_OBSOLETE_TOKEN)
+    : (SUBTASK_NEW_TOKEN | SUBTASK_PARTIAL_TOKEN | SUBTASK_COMPLETE_TOKEN | SUBTASK_OBSOLETE_TOKEN)
     ;
 
 SUBTASK_NEW_TOKEN
-    : '-'
+    : EOL+ '-'
     ;
 
 SUBTASK_PARTIAL_TOKEN
-    : '/'
+    : EOL+ '/'
     ;
 
 SUBTASK_COMPLETE_TOKEN
-    : '*'
+    : EOL+ '*'
     ;
 
 SUBTASK_OBSOLETE_TOKEN
-    : '!'
+    : EOL+ '!'
     ;
 
 S
@@ -102,14 +105,6 @@ fragment DIGIT
     : [0-9]
     ;
 
-START_AMOUNT
-    : '{'
-    ;
-
-END_AMOUNT
-    : '}'
-    ;
-
 // Match printable characters, except space which is covered by S
 CHAR
     : [!-~\u00A0-\u33FF] // ASCII and UNICODE