Code completion, New Project Dialog

-removed unused code for obsolete version of CodeMirror
-removed component dir, which contained unused js files from HFIDE
-updated README.md
-code completion(from Haxe), for HIDE doesn't shows completion for some
reason, currently needs to supply project arguments
-speed up completion debounce to 80 ms (by default 170 ms) to make
completion more responsive.
-ui for new project dialog