Implement support of all SVG elements

[igagis]

Missing elements:
switch,
style,
text,
tspan,
tref,
textPath,
altGlyph,
altGlyphDef,
altGlyphItem,
glyphRef,
marker,
color-profile,
clipPath,
feDistantLight,
fePointLight,
feSpotLight,
feComponentTransfer,
feConvolveMatrix,
feDiffuseLighting,
feDisplacementMap,
feFlood,
feImage,
feMerge,
feMorphology,
feOffset,
feSpecularLighting,
feTile,
feTurbulence,
cursor,
a,
view,
script,
animate,
set,
animateMotion,
animateColor,
animateTransform,
font,
glyph,
missing-glyph,
hkern,
vkern,
font-face,
font-face-src,
font-face-uri,
font-face-format,
font-face-name,
metadata,
foreignObject

[xamidi]

I recently noticed that <text> is not supported yet. Would be great to have it. There is no way right now to render text via svgren, correct?

[igagis]

@xamidi ultimately svgdom will support <text> element, but as for svgren there are no plans to support text rendering.
To workaround this you can convert text to geometry using some SVG editor (for example inkscape).

[igagis]

Partial support for <text> element added