Meshmoon: Make JSON a first class citizen in Tundra. New JSON configs.

[jonnenauha]

JSON core support

• Adds CoreJsonUtils.h that has various functions to parse JSON to QVariant and to serialize QVariant to JSON.
• Adds new dependency QJson http://qjson.sourceforge.net/
  • Dependency build implemented for Windows and Mac.
  • Linux needs to be implemented before this can be merged as this is a core dependency.
  • Currently uses my fork because I had to do windows fixes. Sent to upstream here https://github.com/flavio/qjson/pull/34

Core config JSON support

• New --config support for JSON.
  • Easier to read and write config file format. Less to write compared to the XML format.
  • More flexible type support: Maps of command-to-value pairs, strings or string lists as command-only. Can write numbers as numbers not as "60" (although we still store everything as strings in framework).
• Added new tundra.json that "replaces" plugins.xml and tundra-client.json that "replaces" viewer.xml.
• Both XML and JSON parsing is supported by --config this does not break anything that is out there.
• Did not remove the .xml configs at this point. Id like to get feedback if JSON is flexible enough to express all our potential needs before that is done. Or if it looks like it's not enough the .json configs can be removed to not have overlap in the repo.
  • plugins.xml is still default loaded if no --config startup parameter is present!

Rendering config JSON

• New rendering config using JSON.
  • Single file that has both Ogre resource locations and Ogre plugins.
  • Single file for all platforms. Has Common sections that get processed on all platforms and platform spesific sections.
  • Support for defining --headless run rendering plugin. Even if in config can be overridden with --direct3d9 and --opengl. Defined RenderSystem_Headless as the headless renderer for Windows.
  • Removed old ogre *.cfg files.
• Ability to pass in custom rendering configs with --ogreConfig startup parameter.
• Cleaned up OgreRenderingPlugin and Renderer code.

New headless renderer

I started working on a proper headless renderer at https://github.com/jonnenauha/ogre-headless-renderer. The currently used RenererSystem_Null is buggy (at least in debug mode) and it has a nasty GPL license for Tundra. The new RenderSystem_Headless is tailored for Tundra --headless usage and already working.

With this pull request Windows moves to use the new headless renderer. Build and config paths included. This plugin will be automatically used if defined in the Ogre config headless section. But even then can be overridden with --direct3d9 and --opengl.

Note on dependencies

Linux build path still needs to be implemented using either package manager or from sources, see more at http://qjson.sourceforge.net/build/.

[jonnenauha]

Have been pushing stuff to this branch for the whole weekend and modified the info as I went. Added proper headless support to the config and started working on a proper headless renderer tailored for Tundras --headless usage. Repo can be found here https://github.com/jonnenauha/ogre-headless-renderer and I'll be adding the dep path to Windows at some point.

[jonnenauha]

Mac QJson deps build done here https://github.com/Adminotech/tundra/compare/a1397a0d7584...f2887f660dd8

[jonnenauha]

Moving Windows to the new Headless renderer here https://github.com/Adminotech/tundra/compare/f2887f660dd8...b849735a6816