Implemented exporting symbol fonts;

Rendering symbols to an image always uses anti-aliassing (by downsampling from a large size);
Finished the spoiler export template;
Added <soft-line> tag to make line breaks use the line height for soft line breaks

git-svn-id: svn://svn.code.sf.net/p/magicseteditor/code/trunk@440 0fc631ac-6414-0410-93d0-97cfa31319b6

src/util/string.hpp

@@ -172,5 +172,10 @@ bool is_substr(const String& str, size_t pos, const String& cmp);
 /// Compare two strings for equality, b may contain '_' where a contains ' '
 bool cannocial_name_compare(const String& a, const Char* b);
 
+// ----------------------------------------------------------------------------- : Filenames
+
+/// Make sure a string is safe to use as a filename
+String clean_filename(const String& name);
+
 // ----------------------------------------------------------------------------- : EOF
 #endif