Added string quote handler. Made strings abort on line break to improve performance.

src/main/java/de/platon42/intellij/plugins/m68k/M68kStringQuoteHandler.java

@@ -0,0 +1,10 @@
+package de.platon42.intellij.plugins.m68k;
+
+import com.intellij.codeInsight.editorActions.SimpleTokenSetQuoteHandler;
+import de.platon42.intellij.plugins.m68k.psi.M68kTypes;
+
+public class M68kStringQuoteHandler extends SimpleTokenSetQuoteHandler {
+    public M68kStringQuoteHandler() {
+        super(M68kTypes.STRINGLIT);
+    }
+}

src/main/java/de/platon42/intellij/plugins/m68k/lexer/_M68kLexer.flex

@@ -45,8 +45,8 @@ BINARY=(%[01]+)
 HEXADECIMAL=(\$[0-9a-f]+)
 OCTAL=(@[0-7]+)
 DECIMAL=([0-9]+)
-STRINGLIT=(`([^`\\]|\\.)*`|'([^'\\]|\\.)*'|\"([^\"\\]|\\.)*\")
-PLAINPARAM=(`([^`\\]|\\.)*`|'([^'\\]|\\.)*'|\"([^\"\\]|\\.)*\")|<([^>\\]|\\.)*>|([^,;\p{Blank}\r\n])+ // why does \R not work, I have no idea
+STRINGLIT=(`([^`\\\r\n]|\\.)*`|'([^'\\\r\n]|\\.)*'|\"([^\"\\\r\n]|\\.)*\")
+PLAINPARAM=(`([^`\\\r\n]|\\.)*`|'([^'\\\r\n]|\\.)*'|\"([^\"\\\r\n]|\\.)*\")|<([^>\\\r\n]|\\.)*>|([^,;\p{Blank}\r\n])+ // why does \R not work, I have no idea
 COMMENT=([;].*+)
 HASH_COMMENT=([#;*].*+)