Rename template, crates and placeholders #22

Job	Run time
xtask test & lint	1m 55s
test (windows-2022, spirv-builder)	3m 29s
test (macOS-latest, cargo-gpu)	3m 34s
test (windows-2022, cargo-gpu)	3m 24s
test (ubuntu-24.04, cargo-gpu)	1m 41s
lint (cargo-gpu)	1m 46s
test (ubuntu-24.04, spirv-builder)	1m 55s
test (macOS-latest, spirv-builder)	3m 37s
lint (spirv-builder)	1m 41s
test_success	2s
	23m 4s

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