[#53] Use typed entrypoints in call/callFrom

Description

Problem: In !499 (merged), we changed call and callFrom to use typed instead of untyped addresses. This helps make sure the contract is called with a parameter of the correct type.

However, these functions still take untyped entrypoints (i.e. EpName). This doesn't work, because the contract's parameter type should change depending on which entrypoint we're calling, but, as it stands, it doesn't.

See this comment for context: !499 (comment 388408872)

Solution: Change call and callFrom to accept a typed entrypoint instead.

Related issue(s)

Resolves part of #53 (closed)

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