Added auto wrap option (and grammar) for sequenceDiagrams

Added inline config and init(ialization) grammar
Added reinitialize functionality to mermaidAPI (not to be confused with initialize)
Added actorFontWeight, noteFontWeight, messageFontWeight, wrapEnabled, wrapPadding
Added wrapLabel and breakWord functions to intelligently wrap text based on a pixel-based width instead of column-based
  - The implementation is largely from Carys Mills: https://medium.com/@CarysMills/wrapping-svg-text-without-svg-2-ecbfb58f7ba4
  - Made slight modifications for mermaid-js
Fixed dark theme color inconsistencies for sequence diagrams
Removed !important from sequence scss as this prevents any client overrides
Fixed various invalid css values in sequence scss which prevented proper rendering of various elements
Added detectInit to utils for initialization json detection
Updated detectType to support the existence or absence of the intialization configuration
Updated calculateTextWidth to include fontWeight

src/utils.spec.js

@@ -7,6 +7,16 @@ describe('when detecting chart type ', function() {
     const type = utils.detectType(str);
     expect(type).toBe('flowchart');
   });
+  it('should handle an initialize defintion', function() {
+    const str = 'initialize: { "logLevel": 0, "theme": "dark" }\ngraph TB\nbfs1:queue';
+    const init = JSON.stringify(utils.detectInit(str));
+    expect(init).toBe('{"logLevel":0,"theme":"dark"}');
+  });
+  it('should handle an init defintion', function() {
+    const str = 'init: { "logLevel": 0, "theme": "dark" }\ngraph TB\nbfs1:queue';
+    const init = JSON.stringify(utils.detectInit(str));
+    expect(init).toBe('{"logLevel":0,"theme":"dark"}');
+  });
   it('should handle a graph defintion with leading spaces', function() {
     const str = '    graph TB\nbfs1:queue';
     const type = utils.detectType(str);