GstValue, GstStructure: allow '%' character in GST_ASCII_IS_STRING
HTML-escaped string can have '%'. If GST_ASCII_IS_STRING allows '%', we can use the string without a backslash.
Fixes: #57
Edited by Tim-Philipp Müller
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HTML-escaped string can have '%'. If GST_ASCII_IS_STRING allows '%', we can use the string without a backslash.
Fixes: #57