Use SVG for icons instead of PNG

As an alternative to php-debugbar#270 based on the suggestion in [this comment](php-debugbar#270 (comment)) I’ve provided a CSS file with embedded SVGs rather than the included font awesome.

There are pros and cons to each approach, but I’d love to see vector icons in the default debug bar.

Author: tburry

src/DebugBar/Resources/debugbar.css

@@ -97,7 +97,7 @@ div.phpdebugbar-closed, div.phpdebugbar-minimized{
 /* -------------------------------------- */
 
 div.phpdebugbar-header, a.phpdebugbar-restore-btn {
-    background: #efefef url(data:image/png;base64,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)  no-repeat 5px 4px;
+    background: #efefef url(data:image/svg+xml,%3Csvg%20viewBox%3D%220%200%2020%2020%22%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%3E%3Ccircle%20fill%3D%22%23000%22%20cx%3D%2210%22%20cy%3D%2210%22%20r%3D%229%22%2F%3E%3Cpath%20d%3D%22M6.039%208.342c.463%200%20.772.084.927.251.154.168.191.455.11.862-.084.424-.247.727-.487.908-.241.182-.608.272-1.1.272h-.743l.456-2.293h.837zm-2.975%204.615h1.22l.29-1.457H5.62c.461%200%20.84-.047%201.139-.142.298-.095.569-.254.812-.477.205-.184.37-.387.497-.608.127-.222.217-.466.27-.734.13-.65.032-1.155-.292-1.518-.324-.362-.84-.543-1.545-.543H4.153l-1.089%205.479zM9.235%206.02h1.21l-.289%201.458h1.079c.679%200%201.147.115%201.405.347.258.231.335.607.232%201.125l-.507%202.55h-1.23l.481-2.424c.055-.276.035-.464-.06-.565-.095-.1-.298-.15-.608-.15H9.98L9.356%2011.5h-1.21l1.089-5.48M15.566%208.342c.464%200%20.773.084.928.251.154.168.19.455.11.862-.084.424-.247.727-.488.908-.24.182-.607.272-1.1.272h-.742l.456-2.293h.836zm-2.974%204.615h1.22l.29-1.457h1.046c.461%200%20.84-.047%201.139-.142.298-.095.569-.254.812-.477.205-.184.37-.387.497-.608.127-.222.217-.466.27-.734.129-.65.032-1.155-.292-1.518-.324-.362-.84-.543-1.545-.543H13.68l-1.089%205.479z%22%20fill%3D%22%23FFF%22%2F%3E%3C%2Fsvg%3E)  no-repeat 5px 4px / 20px 20px;
 }
 div.phpdebugbar-header {
   padding-left: 29px;
@@ -192,19 +192,19 @@ div.phpdebugbar-minimized a.phpdebugbar-maximize-btn { display: block}
 div.phpdebugbar-minimized a.phpdebugbar-minimize-btn { display: none}
 
 a.phpdebugbar-minimize-btn {
-  background:url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAA4AAAAOCAYAAAAfSC3RAAAAZklEQVR4nM3OMQ4CIRAF0HcFVyvXErl/6VWM7eo11gYSQiBC5f5mksl/meFfCXggznSueGNPs4UDttT5YIUznmnZwvcC7XjhUl5t4Vh8k9GtfqeFf6IeHkI9PIRqPIVyTlhm0QHzBSfMK4g2snfEAAAAAElFTkSuQmCC)  no-repeat 6px 6px;
+  background:url(data:image/svg+xml,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20viewBox%3D%220%200%201792%201792%22%20id%3D%22chevron-down%22%3E%3Cpath%20d%3D%22M1683%20808l-742%20741q-19%2019-45%2019t-45-19l-742-741q-19-19-19-45.5t19-45.5l166-165q19-19%2045-19t45%2019l531%20531%20531-531q19-19%2045-19t45%2019l166%20165q19%2019%2019%2045.5t-19%2045.5z%22%2F%3E%3C%2Fsvg%3E) no-repeat 6px 6px / 14px 14px;
 }
 
 a.phpdebugbar-maximize-btn {
-  background:url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAA4AAAAOCAYAAAAfSC3RAAAAZklEQVR4nM3OsQmAMBCF4Z+kcA13sUxhq9sZcAHBLVzIIqBNAuG4aNLlwVXvvuOglxhgbEUW2IEbcK3oiVOFJarCEgXg+sMaWoABOL/wJtCadRqeUnkUkIYDMOeFj++Vkna0w73nBRurK28mVdKbAAAAAElFTkSuQmCC)  no-repeat 6px 6px;
+  background:url(data:image/svg+xml,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20viewBox%3D%220%200%201792%201792%22%20id%3D%22chevron-up%22%3E%3Cpath%20d%3D%22M1683%201331l-166%20165q-19%2019-45%2019t-45-19l-531-531-531%20531q-19%2019-45%2019t-45-19l-166-165q-19-19-19-45.5t19-45.5l742-741q19-19%2045-19t45%2019l742%20741q19%2019%2019%2045.5t-19%2045.5z%22%2F%3E%3C%2Fsvg%3E) no-repeat 6px 6px / 14px 14px;
 }
 
 a.phpdebugbar-close-btn {
-  background: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAA4AAAAOCAYAAAAfSC3RAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAAAYdEVYdFNvZnR3YXJlAHBhaW50Lm5ldCA0LjAuM4zml1AAAADDSURBVDhPxZCxCsIwFEUzuGdwCvQD7BIIcehUXDqVfGM/wsG/iG4ifkzMlRuSPLo4eeFBue8c6Iv6b4wxW557Hs0KnWa3seqDxTiOyVqbhmF4UND4Rofdruyce3rvE6bIRSo9GOI1McbLPM/vVm4l7MAQr0kpHaQsJTDE+6zrepym6SVFdNgR69M+hBTLzWCI10gJvydvBkO8ZlmWayvhJnkzGOI1+fBTCOHWPkT7YNiBId4HizxnCKy+r81uX/otSn0A7dioI/vYX+8AAAAASUVORK5CYII=) no-repeat 9px 6px;
+  background: url(data:image/svg+xml,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20viewBox%3D%220%200%201792%201792%22%20id%3D%22close%22%3E%3Cpath%20d%3D%22M1490%201322q0%2040-28%2068l-136%20136q-28%2028-68%2028t-68-28l-294-294-294%20294q-28%2028-68%2028t-68-28l-136-136q-28-28-28-68t28-68l294-294-294-294q-28-28-28-68t28-68l136-136q28-28%2068-28t68%2028l294%20294%20294-294q28-28%2068-28t68%2028l136%20136q28%2028%2028%2068t-28%2068l-294%20294%20294%20294q28%2028%2028%2068z%22%2F%3E%3C%2Fsvg%3E) no-repeat 9px 6px / 14px 14px;
 }
 
 a.phpdebugbar-open-btn {
-  background: url(data:image/png;base64,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) no-repeat 8px 6px;
+  background: url(data:image/svg+xml,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20viewBox%3D%220%200%201792%201792%22%20id%3D%22folder-open%22%3E%3Cpath%20d%3D%22M1815%20952q0%2031-31%2066l-336%20396q-43%2051-120.5%2086.5t-143.5%2035.5h-1088q-34%200-60.5-13t-26.5-43q0-31%2031-66l336-396q43-51%20120.5-86.5t143.5-35.5h1088q34%200%2060.5%2013t26.5%2043zm-343-344v160h-832q-94%200-197%2047.5t-164%20119.5l-337%20396-5%206q0-4-.5-12.5t-.5-12.5v-960q0-92%2066-158t158-66h320q92%200%20158%2066t66%20158v32h544q92%200%20158%2066t66%20158z%22%2F%3E%3C%2Fsvg%3E) no-repeat 8px 6px / 14px 14px;
 }
 
 .phpdebugbar-indicator {