refactor

[e-kwsm]

• build: set cpp_std to c++11
• fix: -Wzero-as-null-pointer-constant
• fix: -Wlogical-not-parentheses
• fix: modernize-redundant-void-arg
• fix: -Wwritable-strings
• refactor: performance-type-promotion-in-math-fn
• refactor: readability-avoid-const-params-in-decls

[marvinfriede]

Thanks for the fixes. Can this be merged?

[marvinfriede]

Bump @e-kwsm

[e-kwsm]

Yes, this PR is ready.