Rename template, crates and placeholders #24

Job	Run time
test (windows-2022, spirv-builder)	3m 30s
test (macOS-latest, cargo-gpu)	2m 36s
xtask test & lint	2m 2s
test (ubuntu-24.04, cargo-gpu)	1m 46s
test (macOS-latest, spirv-builder)	3m 1s
lint (cargo-gpu)	6m 56s
test (ubuntu-24.04, spirv-builder)	1m 44s
lint (spirv-builder)	5m 36s
test (windows-2022, cargo-gpu)	3m 23s
test_success	2s
	30m 36s

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