Scriban 0.7.0

> 0.7.0 - Improve extensibility - Breaking change: Replace ScriptDate by DateTime to avoid conversions - Breaking change: Internals of ScriptNode evaluation changed. TemplateContext is now propagated to ScriptObject when evaluating function - New: Add support for math.format and math.is_number > 0.6.0 - Change ScriptObject.IsReadOnly to virtual - Make ScriptArray methods mostly virtual - Make array functions modifying an IList to instead return a modified copy of it > 0.5.0 - Breaking changes. Rename IScriptObject.IsReadOnly to CanWrite. Add IScriptObject.IsReadOnly for global object locking - Catch exceptions while evaluating an expression and rethrow them wrapped into a ScriptRuntimeExecption if it is not already the case. > 0.4.0 - Breaking changes. Split Runtime namespace into Functions and Model. > 0.3.1 - Rewrite support for frontmatter to allow usage of +++ instead of code block {{...}} > 0.3.0 - Add support date.format (global date default format) - Add support for verbatim string escaped by backsticks `...` - Add support for regex functions (regex.split, regex.replace, regex.match) > 0.2.2 - Add support for accessing generic dictionary > 0.2.1 - Fix issue with string.capitalize returning an empty string when the string is already capitalized. > 0.2.0 - Update to latest NETStandard.Library 1.6.0