Update to HDR rendering used by the RenderPassCameraFrame

[mvaligursky]

• avoided an issue where the rendering of the scene in HDR mode using render passes was brighter than without render passes. Updated lighting intensities to bring it to expected brightness now.
• use SHADER_FORWARDHDR for rendering in HDR, which can be now set on a camera as a shader pass, instead of changing global gamma / tonemapping settings on a scene
• fixed an issue with skydome shader generator where in HDR mode it would still gamma correct the output. This is now linear.
• updated few examples with the changes the way bloom is enabled