Feature Request: Portable mode

[CebolaBros64]

Feature Request: Portable mode

A portable mode which can be enabled via a launch argument, akin to the one in RHRE. Changes the location where the .polyrhythmmania/ directory can be found to be in the same directory as the PolyrhythmMania.jar executable.

Justification

Paraphrasing the RHRE docs: "[...] useful for portable flash drives."
Personally, I have PrMania saved on an external hard drive, and would rather to have my preferences stored alongside the game to it being in my home folder, in a different hard drive.

[chrislo27]

The temporary files folder is stored in the tmp directory inside .polyrhythmmania and is used for things including decoding music. Rapid I/O access is important for these files. Therefore, the temp directory may still be placed on the same drive as the user home, going with the reasonable assumption that the user home is on the boot drive most of the time.

Additionally, asking the user if they want to automatically migrate the .polyrhythmmania directory over when a new version is released would be handy.

[chrislo27]

Elevated to an issue in #11.

[chrislo27]

Implemented as of v1.0.1.