Improved JavaFX darcula support

Improved darcula support for JavaFX. More block types are using proper dark background and light text colors.

Preview theme in settings (light vs. darcula)

Theme in preview can be switched from light to darcula independent of IDE theme

Better Linux/MacOS Support for JavaFX preview

• Handling of Linux and MacOS file names for image preview in JavaFX

Darcula and Click-on-Preview

• Added darcula theme for JavaFX preview
• Clicking on JavaFX preview will set cursor position in editor (thanks to @kastork for the idea)

Fighting hanging JavaFX panels on MacOS

setScene now called from FxThread instead of AWT thread to avoid blocking GUI on MacOS (#133)

Finalizing JavaFX scrolling functionality

• Initialization message appears only during initialization
• No error message if user switches to a setup where JavaFX preview is no longer available.

JavaFX autoscrolling preview #3 - detect 64bit JVM on Mac

• fixed detection of Mac 64 JVM to be able to activate JavaFX preview
• click-on-url for JavaFX improved, when slow-loading external images are referenced

JavaFX autoscrolling preview #2 - improved stability by restricting to 64bit JDK

• revised constrained/unconstrained detection
• Fix problem in syntax highlighting leading to PSI Parser Exceptions
• refreshing images on JavaFX only if their content has changed to save memory consumption
• Limiting JavaFX preview to 64bit platforms due to problems especially with Windows OpenJDK 32bit (as default on Windows).

If you want to use JavaFX preview, you'll need to run IntelliJ with 64bit Java. For IntelliJ you'll need to have an environment variable IDEA_JDK pointing to the installation folder of a 64bit Java. See Jetbrains support database for more information.

UPDATE: Known Bug - JavaFX preview will not work on MacOS in this preview. Will work again in the next preview!

Fixing PSI Parser Exceptions and restrict JavaFX to 64bit

• Fix problem in syntax highlighting leading to PSI Parser Exceptions
• disable automatically refreshing images on JavaFX (to be re-enabled in 0.15.x)
• Limiting JavaFX preview to 64bit platforms due to problems especially with Windows OpenJDK 32bit (as default on Windows).

JavaFX autoscrolling preview #1 - initial

This is the first preview release for feedback about the JavaFX preview automatically scrolling to the position of the cursor in the editor.

• JavaFX Preview will automatically scroll to the cursor position of the editor
• JavaFX preview will automatically open links in the systems's default browser
• correct usage of constrained/unconstrained AsciiDoc formatting
• Caching rendering instances of Asciidoctor for better performance

IntelliJ 15 (including AppCode 3.3, CLion 1.2, DataGrip 1.0, PhpStorm 10, PyCharm 5, RubyMine 8, WebStorm 11) is the new minimum version required for this release.