Fixed issue with idea-multimarkdown.

- JavaFX does not support lookbehind
 - (?) It also appears that named regex groups are also unsupported for both mermaid and javafx

Update:
 - Fixed an issue where setLogLevel did not properly handle 'named' log levels
 - Backwards compatibility should be preserved, any/all %%{...}%% directives will be correctly processed by the grammar and properly ignored for any/all graph types that do not support them.

 - Multiline directives will render an error (as they should) if they are not accounted for in the .jison grammar

src/diagrams/sequence/sequenceDb.js

@@ -14,7 +14,6 @@ let configUpdated = false;
 let currentDirective = {};
 
 export const parseDirective = function(statement, context) {
-  logger.info(`statement: ${statement} ctx: ${context}`);
   try {
     if (statement !== undefined) {
       statement = statement.trim();