FreeMarker: Encoding built-in tests

html: [&<>"'{}\a/]
xml:  [&<>"'{}\a/]
rtf:  [&<>"'\{\}\\a/]
html: [a&amp;a&lt;a&gt;a&quot;a'a{a}a\]
xml:  [a&amp;a&lt;a&gt;a&quot;a&apos;a{a}a\]
rtf:  [a&a<a>a"a'a\{a\}a\\]
html: [&lt;&lt;&lt;&lt;&lt;]
xml:  [&lt;&lt;&lt;&lt;&lt;]
rtf:  [\{\{\{\{\{]
html: []
xml:  []
rtf:  []
html: [a]
xml:  [a]
rtf:  [a]
html: [&amp;]
xml:  [&amp;]
rtf:  [\{]