FEM: modernize C++: use range-based for loop #89

Job	Run time
make / make (macos-latest, 3.11, 64) / Conda build for macos-latest 64 py3.11	11m 40s
make / make (ubuntu-latest, 3.11, 64) / Conda build for ubuntu-latest 64 py3.11	1h 19m 22s
make / make (self-hosted-mac, arm64, 3.11) / Conda build for self-hosted-mac arm64 py3.11	4m 48s
make / make (ubuntu-latest, 3.11, aarch64) / Conda build for ubuntu-latest aarch64 py3.11	1h 21m 52s
make / make (windows-2019, 3.8, 64) / Conda build for windows-2019 64 py3.8	1h 2m 50s
make / make (windows-2019, 3.11, 64) / Conda build for windows-2019 64 py3.11	59m 44s
make / make (self-hosted-mac, arm64, 3.11) / bundle	0s
make / make (macos-latest, 3.11, 64) / bundle	0s
make / make (windows-2019, 3.11, 64) / bundle	0s
make / make (windows-2019, 3.8, 64) / bundle	0s
make / make (ubuntu-latest, 3.11, 64) / bundle / Make bundle on ubuntu-latest 64 py3.11	33s
make / make (ubuntu-latest, 3.11, aarch64) / bundle / Make bundle on ubuntu-latest aarch64 py3.11	41m 38s
	5h 42m 27s

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