Read placeholders from `cargo-generate.toml` #29

Job	Run time
test (windows-2022, spirv-builder)	8m 0s
lint (cargo-gpu)	7m 13s
test (macOS-latest, cargo-gpu)	6m 50s
test (ubuntu-24.04, cargo-gpu)	7m 3s
xtask test & lint	2m 2s
test (macOS-latest, spirv-builder)	5m 36s
lint (spirv-builder)	5m 37s
test (ubuntu-24.04, spirv-builder)	5m 59s
test (windows-2022, cargo-gpu)	12m 38s
test_success	3s
	1h 1m 1s

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