Look for currentColor in case-insensitive manner

[dilyanpalauzov]

OpenHAB-Android uses this library to present to the user images. In particular depending on user preferences, it substitutes currentColor with either black or white.

The problem is that I spelled CurrentColor, which has not worked. https://www.w3.org/TR/css-color-3/ says for “system colors” and CSS3-named colors that these are case-insensitive. As far as I tried, browsers handle currentColor also case-insensitive.

• Change the parser to look for currentcolor in case-insensitive manner.