Rename template, crates and placeholders #25

Job	Run time
test (windows-2022, cargo-gpu)	3m 50s
test (ubuntu-24.04, spirv-builder)	3m 53s
xtask test & lint	2m 34s
test (ubuntu-24.04, cargo-gpu)	3m 53s
lint (spirv-builder)	1m 27s
test (macOS-latest, spirv-builder)	3m 56s
test (macOS-latest, cargo-gpu)	3m 56s
test (windows-2022, spirv-builder)	3m 50s
lint (cargo-gpu)	2m 19s
test_success	3s
	29m 41s

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