problem occurs because there is no check for duplicate entries in the
paths vector.
The fix is implemented using the combination of two containers; a vector
to ensure the insertion order and a set to ensure the uniqueness the
entries. The set first attempts to insert the new path and uses the
return of insertion to decide if the vector needs to be updated.
This PR drops the use of brew for dependency management in favor of
macports so we can support lower macOS versions instead of just the
lowest one supported by Apple
Closes#2586
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Rationale: The `IMHEX_PLUGINS_IN_SHARE` is a hack to prevent the appimage from loading plugin from system imhex installation, like /usr/lib/imhex/
In reality, I do not think people compile plugins specifically for the AppImage (plugins must be compiled for the specific imhex & compiler version the imhex binary is used), and this lets us remove the hack
