with this fix, initial updateRequest() might be performed before rendering the window for the first time, thus eliminating shortly visible "Loading..." panel

(this commit partially reverts 8fb202f0)

(Case of libraries configured as jar folders) IDEA-140074 Find in Path not working in jar file paths - Directory scope not working as before

* detect presence of renderers in left/right areas
* allow to force area visibility
* allow to create custom renderers, that do not paint themself in left/right areas

[mvc] move grails vm options to grails plugin, extract completeClassesAndPackages() for reusing, replace anonymous class with lambda

*Add html file template for code highlighting in which scripts, css paths and task text  should be inserted. In order to add new language highlighting, add script resource for language is needed
*Add needed css and scripts for c-like and python languages into resources
*Add ability to provide default highlighting mode in StudyToolWindowConfigurator

Remove getting study check action from StudyExecutor. Now language specific check action is provided by StudyToolWindowConfigurator

Remove Task.WithResult usage from StudyProjectPanel class in order to provide compatibility with IDEA 15