Add code for use with 'merge_SSS' core branch.
Add 'libstdc++-6.dll' to list of load libs. Since now, this lib is need for the exporter if use MinGW builds.
Merge branch 'master' into merge_SSS
merge master into merge_SSS
Merge branch 'master' into merge_SSS

Conflicts:
	io/yaf_integrator.py
Solve conflict for fix indentation error in AO
after merge from master
Add all create light cases with 'use_ibl' to checkSceneLights() function.
Add all 'cases' for use lights with bidirectional integrator
Fix last bad copy/paste branch's report by wizofboz:
   - change 'fg_samples' line to 'bounces' in photonmap
Merge branch 'master' of https://github.com/YafaRay/Blender-Exporter
Delete comments and add some description text.
Rename 'yaf_mapworld_type' variable to 'bg_mapping_type'
Expand checkSceneLights() function.
Delete unused 'use_color_management' from presets.
Change 'yaf_mapworld_type' variable  name  to 'bg_mapping_type'
Change some old project names.
Re-define some style code.
Uncomment UV layers code: now this feature is work ( new more test..)
Change some panel names ( delete old project references..)
Applied mapping variable change name.
Hide some panels for 'texture background' mode.
Change  some variable names:
    -'tex_in' variable  for more explicit 'mapName'.
    - diffRoot to 'maskRoot' for texture mask slot in Blend material.
    - 'diff_layer' to 'mask_layer' in Blend material.
Refine code for 'negative' and 'noRGB' variables.
Change some style code.
Fix error in last commit
Update Blender version compatibility
Add 'phaseFunction' and 'sssPresets' variables for SSS.
Sync some variable names by core 'registerFactory' value names
Add 'use_limited_texture_context' variable from Blender.
Add SSS texture slots.
Add 'phaseFunction' and 'sssPresets' UI items for SSS
Change some UI explicit descriptions for SSS items.