Hey, the wait is over, 4.18 is released! 
As for your SVG problem, the “RGBA rendering” works as intended:
But you probably want to import it as distance field texture:
This leads to an import error which says that the renderer cannot process your SVG paths (which can have any number of reasons), but it also suggests a solution:
To do that, you have to check the “Convert All Elements to Path” option in the import dialog:
This allows you to import the SVG, but as you can see there are some artefacts and the explosion is messed up:
The problem is you have too many contours in your SVG. The renderer “fills” every closed shape, but if you stack shapes onto one another then it creates a hole in the shape. You are stacking a lot of unnecessary shapes onto each other:
So, after a little bit of cleaning the SVG up in Inkscape by removing the unnecessary shapes, it can be imported rather nicely (at least the bullet):
As you can see, the explosion still creates artefacts, because there are too many overlapping shapes. I hope this helps you to create SVGs which can be nicely imported