requiredFeatures almost always evaluates to false

Bug Description

Due to incorrect coding of line 219 in conditions.cpp, only the feature:
http://www.w3.org/TR/SVG11/feature#SVG
will ever match. The code says:
<code>
for ( unsigned int i = 0 ; i < sizeof(_supported_features)/sizeof(_supported_features[0]); i++ ) {
if ( 0 == strcasecmp(feature, _supported_features[0]) )
return true;
}
return false;
</code>
It should say:
<code>
for ( unsigned int i = 0 ; i < sizeof(_supported_features)/sizeof(_supported_features[0]); i++ ) {
if ( 0 == strcasecmp(feature, _supported_features[i]) )
return true;
}
return false;
</code>

Have uploaded proposed fix

Hi there, it appears this still hasn't been merged into master. As Inkscape now uses GitLab, would you like to submit a merge request there? Here's our GitLab repo: https://gitlab.com/inkscape/inkscape. Thank you!

Committed in https://gitlab.com/inkscape/inkscape/commit/2b5d32c80bbb3a00470001b33f23e796f5818ea2