SafeString

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Fix warnings about `F` redefinition on ESP32 (and elsewhere?)

3

Compiling SafeString on many architectures generates a lot of warnings about redefining the `F` macro. From [the code](https://github.com/PowerBroker2/SafeString/blob/cd3c271685a6d5dbb7a33b526791a4f476149add/src/SafeString.h#L137): ``` //#ifndef F // Arduino IDE 2+ adds namespace around this macro...

egnor

Make compatible with PlatformIO

8

I found I couldn't build projects using this library with PlatformIO because you use Printable without prefixing the Arduino namespace to it. Simply adding this fixes it, and everything still...

twhiston