This commit fixes weird line breaks when rendering CJK (Chinese, Japanese, Korean) characters. Each CJK character is more like a word instead of a letter. This commit fixes the logic of line breaks by introducing a new `NVG_CJK_CHAR` code point type and takes special care for formatting text including CJK characters.

nvgRoundedRectEx for varying corner radii

Conflicts:
	src/nanovg.h

Fixes a bug when applying `NVG_IMAGE_FLIPY`.

This commit fixes issue #167 that `nvgImagePattern()` does not handle coordinate well if the specified image applies the `NVG_IMAGE_FLIPY` parameter.

Rename nvglImageFromHandleGL2 -> nvglImageHandleGL2

There was no nvglImageFromHandleGL2 implementation, it must have been
an error during some refactoring

Fallbacks to default composite operation when invalid one is specified.

This commit fixes #300 and #306 that “control may reach end of non-void function” error occurs in `glnvg_convertBlendFuncFactor()`. The function now returns `GL_INVALID_ENUM` for invalid blend factor and if that happens, `glnvg__blendCompositeOperation()` uses default source-over composite operation.

Fixes the kerning value for freetype.

This commit fixes issue #302 that the kerning value returned by freetype is not converted to integer properly.

Support fallback fonts (code refactoring for #299)

This commit fixes the formats as suggested in #299 and fixes stack overflow when using `freetype` backend.

Implements composite operation for blending renderings.

This commit updates the implmentation of global composite operation to follow the advices described at c4b865796d (r74248556)

This commit implements the `nvgGlobalCompositeOperation()` function to support blending between frames. All operations defined in HTML5 canvas API are supported. Also, it is possible to create custom composite operation by calling `nvgBlendFunc()` or `nvgBlendFuncSeparate()` functions.

Add support for bgfx

This commit updates the `nvgBeginFrame()` function to forward the received `devicePixelRatio` parameter to the `renderViewport()` function so it is possible to configure the environemnt correctly when using `bgfx` backend.

Fixing clang compiler warnings.

Fix typo in nvgCreateFontMem() description

- nvglImageHandle was changes to contain GL postfix, changed GL utils
to use that too
- fixed silly failure check bug in FBO demo

Fixed fontstash.h crashing

Fix for issue #172

fixed type usage

in some situations int and GLsizei is not the same type which leads to conversion warnings

Improve the use of NVGLUframebuffer.

The `NVGLUframebuffer` structure contains a `ctx` member but was actually never used. This commit takes advantage of the `ctx` property so there is no need to keep the reference of the context elsewhere after calling `nvgluCreateFramebuffer()`, or it would add difficulty for maintenance. As a result, the `nvgluDeleteFramebuffer()` function only needs to take one `NVGLUframebuffer` instance as the parameter.

Fix spelling mistake in readme

Fix typos.

- fixed stroke to use lino join style to calculate required vertex
count

Line break would duplicate a word if the first character of a word
would cause a line break

Added check in addPoint to avoid duplicated moveTos breaking

Redundant GL state filter