String formatting

[minchingtonak]

Basil should have some way to easily format strings. Here are a couple syntax proposals.

The percent symbol could be swapped out for something like # or $.

• ("hello %0 %1" format "world" true) -> yields "hello world true"
• `hello %{"world"} %{true}` -> yields "hello world true"

[dumblob]

Hm, I'd prefer as much compatibility with existing string formatting & interpolation solutions (beginning with printf from the C standard through V up to e.g. Python).