Terrain editor now edits *.tobj files in place

[ohlidalp]

There are 3 major features:

1. The terrain editor mode now edits `*.tobj`` files directly. The 'logs/editor_out.log' file is history. Just enter/exit the terrain editor mode and changes will persist. Note this works only if the terrain is unzipped in a directory (= a project), otherwise game will show a console/chatbox warning "cannot export - not a project".
2. The game has integrated project importer script - just enter terrain editor on Zipped terrain and it will pop up. Closing the script will exit terrain editor and vice versa.
3. Experimental: new [Races] section in terrn2, processed by the race system. Converting the classic races defined in scripts is done automatically by the importer. Under [Races], there is 1 file per race. I tested this on Auriga Proving Grounds.

Known issues:

• preloaded actors rotations are off
• the script editor may crash, reporting it received a C++ exception:

  23:17:20: [RoR|Script|Notice] Executing main() in road_editor_COLMESH_DEVEL.as(category:CUSTOM,unique ID:12)
  23:17:20: [RoR|Script|Notice] Road editor loaded! Enter terrain editing mode (hotkey: CTRL+Y) to use it.
  23:17:20: [RoR|Script|Notice] The script finished successfully.
  23:19:46: [RoR|Script|Notice] The script ended with exception; details below:
  23:19:46: [RoR|Script|Notice] 	context.ExceptionLineNumber: 1950
  23:19:46: [RoR|Script|Notice] 	context.ExceptionString: Caught an exception from the application
  23:19:46: [RoR|Script|Notice] 	context.ExceptionFunction.Declaration: void ScriptEditorTab::foldRegionInternal(string)
  23:19:46: [RoR|Script|Notice] 	context.ExceptionFunction.ModuleName: script_editor.as(category:CUSTOM,unique ID:1)
  23:19:46: [RoR|Script|Notice] 	context.ExceptionFunction.ScriptSectionName: script_editor.as
  23:19:46: [RoR|Script|Notice] 	context.ExceptionFunction.ObjectName: ScriptEditorTab
  23:19:46: [RoR|Script|Notice] ScriptEditor: Killing script 'script_editor.as' (NID 1) because it triggered an AngelScript exception;     you can disable this behavior in top menu 'Tools/Settings'.
  

Notes to code reviewers:

• I did a roundup of file format handlers -> a lot of find&replace hapenned, see individual commit descriptions.
• For convenience this branch builds on top of Script updates and fixes #3197 - when that is merged, it will become much leaner.