Remove submodules, use CMake's FetchContent instead. (#534) #114

Job	Run time
Checkout EASTL	14s
Build EASTL (windows-latest, msvc, Debug, std_iter_category_disabled)	3m 15s
Build EASTL (windows-latest, msvc, Debug, std_iter_category_enabled)	3m 32s
Build EASTL (windows-latest, msvc, Release, std_iter_category_disabled)	4m 49s
Build EASTL (windows-latest, msvc, Release, std_iter_category_enabled)	4m 46s
Build EASTL (ubuntu-latest, clang, Debug, std_iter_category_disabled)	2m 9s
Build EASTL (ubuntu-latest, clang, Debug, std_iter_category_enabled)	2m 41s
Build EASTL (ubuntu-latest, clang, Release, std_iter_category_disabled)	2m 10s
Build EASTL (ubuntu-latest, clang, Release, std_iter_category_enabled)	2m 40s
Build EASTL (ubuntu-latest, gcc, Debug, std_iter_category_disabled)	2m 38s
Build EASTL (ubuntu-latest, gcc, Debug, std_iter_category_enabled)	2m 52s
Build EASTL (ubuntu-latest, gcc, Release, std_iter_category_disabled)	3m 6s
Build EASTL (ubuntu-latest, gcc, Release, std_iter_category_enabled)	3m 12s
Run EASTL tests (windows-latest, msvc, Debug)	39s
Run EASTL tests (windows-latest, msvc, Release)	1m 10s
Run EASTL tests (ubuntu-latest, clang, Debug)	25s
Run EASTL benchmarks (windows-latest, msvc, Release)	41s
Run EASTL tests (ubuntu-latest, clang, Release)	21s
Run EASTL benchmarks (ubuntu-latest, clang, Release)	44s
Run EASTL tests (ubuntu-latest, gcc, Debug)	21s
Run EASTL benchmarks (ubuntu-latest, gcc, Release)	43s
Run EASTL tests (ubuntu-latest, gcc, Release)	24s
	43m 32s

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