Generalize the surroundParser, now delimiterParser
Use identityParser like the old surroundParser
Add expressionDelimiter for future logic tokens
Merge branch 'different-delimiters'
Add condition token for if statements
Add tests for one liner and multi line ifs
Add conditionParser for single if statements
Add test for true and false evaluations
Add if statement parsing in renderTemplate
Merge branch 'expression/if'

This only covers a single if statement. There is no else or elif, and the
truth statement only check if the name of a identity is present.