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use emscripten_set_canvas_element_size (#865)

CMake: forward CMAKE_FIND_ROOT_PATH so Dependencies see each other

Main: unify TextureManager::isHardwareFilteringSupported

GL*: fix isHardwareFilteringSupported for floating point textures

Samples: clean up Fresnel materials - only require GLSL120

and drop unused asm shader

Docs: Compositors - change wording to be less post-effect specific

Vector: make arithmetic ops member funcs again to ease language bindings

and maintain backwards compatibility

Vector: use enable_if as function parameter for VC < 2017 compatibility

Main: Compositor - allow RTSS to pick up render_quad materials

Docs: CompositorScript - improve texture directive description

Main: CompositorInstance - do not set DepthBufferPool for depth textures

Main: PixelFormat - depth formats are accessible nowadays

Main: ScriptTranslator - add unknown parameter values to error messages

- shader parameters AutoConstantType
- compositor texture format

GL*: make sure StateCache is fully disabled when not explicitly enabled

GL3+/ ES2: consistently use PixelUtil::isDepth for depth format checking

to be forward compatible for additional depth formats

GL: implement PF_DEPTH16 format for FBOs

Main: slightly clean up compositors code

Main: Vector - add explicit converting constructor and define Vector2/3i

Docs: restructure compositor script section

Main: allow using native endian byte pixel formats in scripts

and port compositors - instead of hardcoding (A)BGR which on most
platforms requires colour conversions.

Docs: manual - merge MaterialManager docs with API description

Media: Cg - use common DualQuaternion shadow shaders from RTShaderLib

Cg: exclude mat arrays from definition renaming with glsl profile

and log an warning that they are not fully supported

Media: Cg - drop arb?p1 profiles and make sure GLSL is used instead

for demanding Cg shaders compilation would fail due to register limits

GL*: do not needlessly bind zero texture

see https://stackoverflow.com/questions/1108589/is-0-a-valid-opengl-texture-id

Main: Vector - re-add unary operator+

GL3+ use glSampler objects for backing Ogre::Sampler if possible

RenderSystem: implement _setSampler in all RenderSystems

and deprecate setting of individual sampler parameters

Script: add sampler and sampler_ref to define and reference samplers

Tests: modify MaterialSerializer test to still work without RenderSystem