add missing favicon types

img/favicon-mask.svg

@@ -0,0 +1,2 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<svg xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns="http://www.w3.org/2000/svg" enable-background="new 0 0 595.275 311.111" xml:space="preserve" height="16" width="16" version="1.1" y="0px" x="0px" xmlns:cc="http://creativecommons.org/ns#" xmlns:dc="http://purl.org/dc/elements/1.1/" viewBox="0 0 16 15.999999"><path d="m2.5-0.000002c-1.385 0-2.5 1.115-2.5 2.5v11c0 1.385 1.115 2.5 2.5 2.5h11c1.385 0 2.5-1.115 2.5-2.5v-11c0-1.385-1.115-2.5-2.5-2.5h-11zm-0.72266 3.75h12.444c0.431 0 0.77832 0.34727 0.77832 0.77832v7.1943c0 0.431-0.34732 0.77734-0.77832 0.77734h-12.444c-0.4306 0-0.777-0.346-0.777-0.777v-7.1947c0-0.4308 0.3464-0.7783 0.7773-0.7783zm0.6563 0.8994-0.5342 0.5352 3.209 3.2324l-2.4307 2.4551 0.53418 0.55957 2.4551-2.4795 1.7744 1.7979h1.1172l1.7744-1.7988 2.4551 2.4551 0.53516-0.53418-2.4062-2.4551 3.1836-3.2324-0.53516-0.53516-5.3467 5.3232h-0.46191l-5.3232-5.3232z"/></svg>