char to symbol in Symmetric/HermitianOperator convert

[codecov[bot]]

Codecov Report

Patch coverage: 78.57% and project coverage change: +0.56 :tada:

Comparison is base (441f15c) 71.31% compared to head (1be7af0) 71.87%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #501 +/- ## ========================================== + Coverage 71.31% 71.87% +0.56% ========================================== Files 81 81 Lines 8533 8545 +12 ========================================== + Hits 6085 6142 +57 + Misses 2448 2403 -45 ``` | [Impacted Files](https://app.codecov.io/gh/JuliaApproximation/ApproxFunBase.jl/pull/501?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=JuliaApproximation) | Coverage Δ | | |---|---|---| | [src/ApproxFunBase.jl](https://app.codecov.io/gh/JuliaApproximation/ApproxFunBase.jl/pull/501?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=JuliaApproximation#diff-c3JjL0FwcHJveEZ1bkJhc2Uuamw=) | `84.00% <ø> (ø)` | | | [src/Operators/general/OperatorLayout.jl](https://app.codecov.io/gh/JuliaApproximation/ApproxFunBase.jl/pull/501?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=JuliaApproximation#diff-c3JjL09wZXJhdG9ycy9nZW5lcmFsL09wZXJhdG9yTGF5b3V0Lmps) | `67.14% <70.00%> (+37.14%)` | :arrow_up: | | [src/LinearAlgebra/clenshaw.jl](https://app.codecov.io/gh/JuliaApproximation/ApproxFunBase.jl/pull/501?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=JuliaApproximation#diff-c3JjL0xpbmVhckFsZ2VicmEvY2xlbnNoYXcuamw=) | `36.31% <100.00%> (ø)` | | | [src/Multivariate/Multivariate.jl](https://app.codecov.io/gh/JuliaApproximation/ApproxFunBase.jl/pull/501?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=JuliaApproximation#diff-c3JjL011bHRpdmFyaWF0ZS9NdWx0aXZhcmlhdGUuamw=) | `55.93% <100.00%> (+1.54%)` | :arrow_up: | ... and [12 files with indirect coverage changes](https://app.codecov.io/gh/JuliaApproximation/ApproxFunBase.jl/pull/501/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=JuliaApproximation)

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