Merge if -> ite renaming from stdlib
#2869
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paulcadman
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…2852) - Syntax for #2804. -⚠️ Depends on #2869. This pr introduces: 1. front-end support (parsing, printing, typechecking) for boolean side conditions for branches of case expressions. 2. Now `if` is a reserved keyword. 3. Multiway `if` is allowed to have only the `else` branch. I've also refactored the parser to be simpler. Example: ``` multiCaseBr : Nat := case 1 of | zero | if 0 < 0 := 3 | else := 4 | suc (suc n) | if 0 < 0 := 3 | else := n | suc n if 0 < 0 := 3; ``` The side if branches must satisfy the following. 1. There must be at least one `if` branch. 4. The `else` branch is optional. If present, it must be the last. Future work: 1. Translate side if conditions to Core and extend the exhaustiveness algorithm. 5. Add side if conditions to function clauses.
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