Print every value when arguments are unpacked

[x0Lazarus]

Calls such as ic(*values) currently print only the first value. Mixed calls can also attach the wrong label: with values = [10, 20, 30] and last = 99, ic(*values, last) prints ic| *values: 10, last: 20, dropping both 30 and 99.

This change prints every argument in order and omits expression labels for calls that unpack arguments. The example now prints ic| 10, 20, 30, 99. Once Python has unpacked the arguments, their values cannot reliably be matched to the original expressions; this fallback avoids guessing or evaluating an iterable again. Ordinary calls keep their labels. The README explains the fallback.

Added tests for mixed and empty expansions, multiple expansions, generators, custom formatting, wrapped output, and return values. On Windows with Python 3.12, all 10 new tests and mypy icecream pass. The full suite has 74 passing tests and one existing Windows path-parsing error in test_context_abs_path_multi_line; the unchanged base has the same error.